console: allow to use console when there are untyped vars (#9864)

* the var will simply be "unknown"
* add a test

command/console.go

@@ -60,11 +60,7 @@ func (c *ConsoleCommand) RunContext(ctx context.Context, cla *ConsoleArgs) int {
 		return ret
 	}
 
-	diags := packerStarter.Initialize()
-	ret = writeDiags(c.Ui, nil, diags)
-	if ret != 0 {
-		return ret
-	}
+	_ = packerStarter.Initialize()
 
 	// Determine if stdin is a pipe. If so, we evaluate directly.
 	if c.StdinPiped() {

command/console_test.go

@@ -35,6 +35,7 @@ func Test_console(t *testing.T) {
 		{"var.list_of_string[0]", []string{"console", `-var=list_of_string=["first"]`, filepath.Join(testFixture("hcl", "variables", "list_of_string"))}, nil, "first\n"},
 		{"var.untyped[2]", []string{"console", filepath.Join(testFixture("hcl", "variables", "untyped_var"))}, nil, "strings\n"},
 		{"var.untyped", []string{"console", `-var=untyped=just_a_string`, filepath.Join(testFixture("hcl", "variables", "untyped_var"))}, nil, "just_a_string\n"},
+		{"var.untyped", []string{"console", filepath.Join(testFixture("hcl", "variables", "untyped_var", "var.pkr.hcl"))}, nil, "<unknown>\n"},
 		{"var.untyped", []string{"console", filepath.Join(testFixture("hcl", "variables", "untyped_var", "var.pkr.hcl"))}, []string{"PKR_VAR_untyped=just_a_string"}, "just_a_string\n"},
 	}