Avoid crash on document close if default template is missing

(cherry picked from commit f6f81cef)

src/ui/interface.cpp

@@ -325,7 +325,7 @@ sp_ui_close_view(GtkWidget */*widget*/)
     INKSCAPE.get_all_desktops(desktops);
     if (desktops.size() == 1) {
         Glib::ustring templateUri = sp_file_default_template_uri();
-        SPDocument *doc = SPDocument::createNewDoc( templateUri.c_str() , TRUE, true );
+        SPDocument *doc = SPDocument::createNewDoc( templateUri.empty() ? nullptr : templateUri.c_str(), TRUE, true );
         // Set viewBox if it doesn't exist
         if (!doc->getRoot()->viewBox_set) {
             doc->setViewBox(Geom::Rect::from_xywh(0, 0, doc->getWidth().value(doc->getDisplayUnit()), doc->getHeight().value(doc->getDisplayUnit())));

[su-v]

JFYI:

/tmp/src/inkscape-git/0.92.x/src/ui/interface.cpp:328:75: error: use of undeclared identifier 'nullptr'
        SPDocument *doc = SPDocument::createNewDoc( templateUri.empty() ? nullptr : templateUri.c_str(), TRUE, true );
                                                                          ^
1 error generated.

(currently, 0.92.x does not require C++11 - in case this is a new requirement, please consider updating the build system accordingly.)

[Patrick Storz]

Fixed in 0c32575a