* InsetExternal.cpp:

* GuiExternal.cpp:
	- do not crash if the list of external templates is empty (bug #3974).

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_6_X@31570 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/qt4/GuiExternal.cpp

@@ -80,6 +80,8 @@ char const * const origin_gui_strs[] = {
 
 external::Template getTemplate(int i)
 {
+	if (external::TemplateManager::get().getTemplates().empty())
+		return Template();
 	external::TemplateManager::Templates::const_iterator i1
 		= external::TemplateManager::get().getTemplates().begin();
 	advance(i1, i);

src/insets/InsetExternal.cpp

@@ -104,7 +104,8 @@ InsetExternalParams::InsetExternalParams()
 	if (defaultTemplateName.empty()) {
 		external::TemplateManager const & etm =
 			external::TemplateManager::get();
-		templatename_ = etm.getTemplates().begin()->first;
+		if (!etm.getTemplates().empty())
+			templatename_ = etm.getTemplates().begin()->first;
 	} else
 		templatename_ = defaultTemplateName;
 }

src/support/lassert.cpp

@@ -20,7 +20,9 @@ void doAssert(char const * expr,  char const * file, long line)
 {
 	LYXERR0("ASSERTION " << expr << " VIOLATED IN " << file << ":" << line);
 	// comment this out if not needed
+#ifdef ENABLE_ASSERTIONS
 	BOOST_ASSERT(false);
+#endif
 }
 
 } // namespace lyx

status.16x

@@ -89,6 +89,8 @@ What's new
 
 - Fix a tex2lyx crash when importing a LaTeX file using an unknown encoding
   (bug 6142).
+  
+- Fix a crash when no external templates are defined (bug 3974).
 
 - Add encoding "ansinew" as a synonym of "cp1252" for the benefit of 
   tex2lyx (bug 6142).