Add stub methods for MasterView.template_kwargs_view() etc.

otherwise subclass has to consider, can i call super() or not?  it still does
for some other views, but at least create/view/edit are common enough that it
should always be able to call super() without concern for those

tailbone/views/master.py

@@ -2077,6 +2077,24 @@ class MasterView(View):
 
         return kwargs
 
+    def template_kwargs_create(self, **kwargs):
+        """
+        Method stub, so subclass can always invoke super() for it.
+        """
+        return kwargs
+
+    def template_kwargs_view(self, **kwargs):
+        """
+        Method stub, so subclass can always invoke super() for it.
+        """
+        return kwargs
+
+    def template_kwargs_edit(self, **kwargs):
+        """
+        Method stub, so subclass can always invoke super() for it.
+        """
+        return kwargs
+
     def get_db_engines(self):
         """
         Must return a dict (or even better, OrderedDict) which contains all