* src/GrampsDb/_GrampsDbBase.py: prevent null event types and

attribute types from being added
	* src/Editors/_EditAttribute.py: prevent null attribute types
	* src/Editors/_EditEvent.py: prevent null attribute types
	* src/AutoComp.py: filter out empty strings
	* src/ImgManip.py: check for file before attempting thumbnailer


svn: r6898

src/Editors/_EditEvent.py

@@ -204,6 +204,13 @@ class EditEvent(EditPrimary):
                           "enter data or cancel the edit."))
             return
 
+        t = self.obj.get_type()
+        if t.is_custom() and str(t) == '':
+            ErrorDialog(
+                _("Cannot save event"),
+                _("The event type cannot be empty"))
+            return
+
         if self.obj.handle == None:
             trans = self.db.transaction_begin()
             self.db.add_event(self.obj,trans)