Update kivy/modules/__init__.py

handle ImportError: try to import just by module name (in case it is user module, not kivy.modules.* one)

kivy/modules/__init__.py

@@ -116,6 +116,10 @@ class ModuleBase:
             modname = 'kivy.modules.{0}'.format(name)
             module = __import__(name=modname)
             module = sys.modules[modname]
+        except ImportError:
+            try:
+                module = __import__(name=name)
+                module = sys.modules[name]
             except ImportError:
                 Logger.exception('Modules: unable to import <%s>' % name)
                 raise