GncQuotes - drop parameterized constructor

The book parameter is only needed while fetching quotes.
In case the user passes one or more commodities to process
the book can be readily derived from the commodity/commodities.
In the other case (fetch all quotes) the user now is
required to pass a book to the call.

gnucash/gnome-utils/dialog-transfer.cpp

@@ -1785,7 +1785,7 @@ gnc_xfer_dialog_fetch (GtkButton *button, XferDialog *xferData)
 
     ENTER(" ");
 
-    GncQuotes quotes (xferData->book);
+    GncQuotes quotes;
     if (quotes.cmd_result() != 0)
     {
         if (!quotes.error_msg().empty())
@@ -1795,7 +1795,7 @@ gnc_xfer_dialog_fetch (GtkButton *button, XferDialog *xferData)
     }
 
     gnc_set_busy_cursor (nullptr, TRUE);
-    quotes.fetch();
+    quotes.fetch (xferData->book);
     gnc_unset_busy_cursor (nullptr);
 
     /*the results should be in the price db now, but don't crash if not. */

gnucash/gnome/dialog-price-edit-db.cpp

@@ -559,7 +559,7 @@ gnc_prices_dialog_get_quotes_clicked (GtkWidget *widget, gpointer data)
     auto pdb_dialog = static_cast<PricesDialog *> (data);
 
     ENTER(" ");
-    GncQuotes quotes (pdb_dialog->book);
+    GncQuotes quotes;
     if (quotes.cmd_result() != 0)
     {
         if (!quotes.error_msg().empty())
@@ -569,7 +569,7 @@ gnc_prices_dialog_get_quotes_clicked (GtkWidget *widget, gpointer data)
     }
 
     gnc_set_busy_cursor (NULL, TRUE);
-    quotes.fetch();
+    quotes.fetch (pdb_dialog->book);
     gnc_unset_busy_cursor (NULL);
 
     /* Without this, the summary bar on the accounts tab

gnucash/gnucash-commands.cpp

@@ -341,7 +341,7 @@ Gnucash::add_quotes (const bo_str& uri)
     if (qof_session_get_error(session) != ERR_BACKEND_NO_ERR)
         cleanup_and_exit_with_failure (session);
 
-    GncQuotes quotes (qof_session_get_book(session));
+    GncQuotes quotes;
     if (quotes.cmd_result() == 0)
     {
         std::cout << bl::format (bl::translate ("Found Finance::Quote version {1}.")) % quotes.version() << std::endl;
@@ -356,7 +356,7 @@ Gnucash::add_quotes (const bo_str& uri)
         std::cerr << bl::translate ("Error message:") << std::endl;
         std::cerr << quotes.error_msg() << std::endl;
     }
-    quotes.fetch ();
+    quotes.fetch (qof_session_get_book(session));
 
     qof_session_save(session, NULL);
     if (qof_session_get_error(session) != ERR_BACKEND_NO_ERR)

libgnucash/app-utils/gnc-quotes.cpp

@@ -66,7 +66,7 @@ public:
     GncQuotesImpl ();
     GncQuotesImpl (QofBook *book);
 
-    void fetch ();
+    void fetch (QofBook *book);
     void fetch (CommVec& commodities);
     void fetch (gnc_commodity *comm);
 
@@ -100,23 +100,12 @@ private:
 /* GncQuotes implementation */
 
 GncQuotesImpl::GncQuotesImpl ()
-{
-    check (nullptr);
-}
-
-GncQuotesImpl::GncQuotesImpl (QofBook *book)
-{
-    check (book);
-}
-
-void
-GncQuotesImpl::check (QofBook *book)
 {
     m_version.clear();
     m_sources.clear();
     m_error_msg.clear();
     m_cmd_result  = 0;
-    m_book = book;
+    m_book = nullptr;
     m_dflt_curr = gnc_default_currency();
 
     auto perl_executable = bp::search_path("perl");
@@ -151,7 +140,11 @@ GncQuotesImpl::sources_as_glist()
 void
 GncQuotesImpl::fetch (CommVec& commodities)
 {
+    if (commodities.empty())
+        return;
+
     m_comm_vec = std::move (commodities);  // Store for later use
+    m_book = qof_instance_get_book (m_comm_vec[0]);
 
     bpt::ptree pt, pt_child;
     pt.put ("defaultcurrency", gnc_commodity_get_mnemonic (m_dflt_curr));
@@ -206,11 +199,16 @@ GncQuotesImpl::fetch (CommVec& commodities)
 
 
 void
-GncQuotesImpl::fetch ()
+GncQuotesImpl::fetch (QofBook *book)
 {
+    if (!book)
+    {
+        m_cmd_result = 1;
+        m_error_msg = "No book set\n";
+        return;
+    }
     auto commodities = gnc_quotes_get_quotable_commodities (
-        gnc_commodity_table_get_table (m_book));
+        gnc_commodity_table_get_table (book));
-
     fetch (commodities);
 }
 
@@ -219,7 +217,6 @@ void
 GncQuotesImpl::fetch (gnc_commodity *comm)
 {
     auto commodities = CommVec {comm};
-
     fetch (commodities);
 }
 
@@ -533,15 +530,10 @@ GncQuotes::GncQuotes ()
     m_impl = std::make_unique<GncQuotesImpl> ();
 }
 
-GncQuotes::GncQuotes (QofBook *book)
-{
-    m_impl = std::make_unique<GncQuotesImpl> (book);
-}
-
 void
-GncQuotes::fetch (void)
+GncQuotes::fetch (QofBook *book)
 {
-    m_impl->fetch ();
+    m_impl->fetch (book);
 }
 
 void GncQuotes::fetch (CommVec& commodities)

libgnucash/app-utils/gnc-quotes.hpp

@@ -45,11 +45,10 @@ class GncQuotes
 public:
     // Constructor - checks for presence of Finance::Quote and import version and quote sources
     GncQuotes ();
-    GncQuotes (QofBook *book);
     ~GncQuotes ();
 
     // Fetch quotes for all commodities in our db that have a quote source set
-    void fetch (void);
+    void fetch (QofBook *book);
     // Only fetch quotes for the commodities passed that have a quote source  set
     void fetch (CommVec& commodities);
     // Fetch quote for the commodity if it has a quote source  set