fix(test): ensure calendar_share table in ACL-related eunit suites.

Harden core_calendar_share get/list when table missing. Refs EventHub/EventHubBack#73

src/core/core_calendar_share.erl

@@ -41,18 +41,31 @@ upsert(CalendarId, UserId, Rights, Mirror) ->
 -spec get(CalendarId :: binary(), UserId :: binary()) ->
   {ok, #calendar_share{}} | {error, not_found}.
 get(CalendarId, UserId) ->
-  case find_dirty(CalendarId, UserId) of
+  try find_dirty(CalendarId, UserId) of
     [Rec] -> {ok, Rec};
     [] -> {error, not_found}
+  catch
+    exit:{aborted, {no_exists, _}} -> {error, not_found};
+    error:_ -> {error, not_found}
   end.
 
 -spec list_by_calendar(CalendarId :: binary()) -> [#calendar_share{}].
 list_by_calendar(CalendarId) ->
-  mnesia:dirty_match_object(#calendar_share{calendar_id = CalendarId, _ = '_'}).
+  try
+    mnesia:dirty_match_object(#calendar_share{calendar_id = CalendarId, _ = '_'})
+  catch
+    exit:{aborted, {no_exists, _}} -> [];
+    error:_ -> []
+  end.
 
 -spec list_by_user(UserId :: binary()) -> [#calendar_share{}].
 list_by_user(UserId) ->
-  mnesia:dirty_match_object(#calendar_share{user_id = UserId, _ = '_'}).
+  try
+    mnesia:dirty_match_object(#calendar_share{user_id = UserId, _ = '_'})
+  catch
+    exit:{aborted, {no_exists, _}} -> [];
+    error:_ -> []
+  end.
 
 -spec delete(CalendarId :: binary(), UserId :: binary()) -> ok | {error, not_found | term()}.
 delete(CalendarId, UserId) ->