Improve reporting when parse_quote throws an exception.

Add more detail to the error message and pass the right value to the
gnc_error_dialog so that the error is actually displayed to the user.

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

@@ -569,7 +569,7 @@ gnc_prices_dialog_get_quotes_clicked (GtkWidget *widget, gpointer data)
     {
         gnc_unset_busy_cursor(nullptr);
         PERR("Price retrieval failed: %s", err.what());
-        gnc_error_dialog(GTK_WINDOW(pdb_dialog), _("Price retrieval failed: %s"), err.what());
+        gnc_error_dialog(GTK_WINDOW(pdb_dialog->window), _("Price retrieval failed: %s"), err.what());
     }
 
     /* Without this, the summary bar on the accounts tab

libgnucash/app-utils/gnc-quotes.cpp

@@ -728,7 +728,7 @@ GncQuotesImpl::parse_quotes (const std::string& quote_str)
 {
     bpt::ptree pt;
     std::istringstream ss {quote_str};
-    const char* what = nullptr;
+    std::string what;
 
     try
     {
@@ -747,15 +747,26 @@ GncQuotesImpl::parse_quotes (const std::string& quote_str)
     }
     catch (...) {
         std::string error_msg{_("Failed to parse result returned by Finance::Quote.")};
+        error_msg += "\n";
+        //Translators: This labels the return value of a query to Finance::Quote written in an error.
+        error_msg += _("Result:");
+        error_msg += "\n";
+        error_msg += quote_str;
         throw(GncQuoteException(error_msg));
     }
-    if (what)
+    if (!what.empty())
     {
         std::string error_msg{_("Failed to parse result returned by Finance::Quote.")};
         error_msg += "\n";
+        //Translators: This is the error message reported by the Online Quotes processing code.
         error_msg += _("Error message:");
         error_msg += "\n";
         error_msg += what;
+        error_msg += "\n";
+        //Translators: This labels the return value of a query to Finance::Quote written in an error.
+        error_msg += _("Result:");
+        error_msg += "\n";
+        error_msg += quote_str;
         throw(GncQuoteException(error_msg));
     }
     return pt;