EOFError [Ran out of input] in Clipboard (#411)

[EOFError: Ran out of input] for Clipboard when you drag and
drop the bolded lines in selected tabs of Person Edit

Attempt to drag and drop any of the "bolded lines" in the Events or
Names tabs into the clipboard window. The unbolded lines drag and drop
ok.

Fixes #8788.

gramps/gui/clipboard.py

@@ -1314,6 +1314,7 @@ class ClipboardListView:
         # Just select the first match.
         wrapper_class = self._target_type_to_wrapper_class_map[
                                                     str(possible_wrappers[0])]
+        try:
             o = wrapper_class(self.dbstate, sel_data)
             if title:
                 o._title = title
@@ -1362,6 +1363,8 @@ class ClipboardListView:
             # remember time for double drop workaround.
             self._previous_drop_time = realTime
             return o_list
+        except EOFError:
+            return None
 
     # proxy methods to provide access to the real widget functions.