Task

- When a duration fails to parse during ::modify, it must raise an exception,
  and not silently skip the attribute.

src/Task.cpp

@@ -2034,8 +2034,6 @@ void Task::modify (modType type, bool text_required /* = false */)
           {
             // The duration is stored in raw form, but it must still be valid,
             // and therefore is parsed first.
-            try
-            {
             Eval e;
             e.addSource (domSource);
             e.addSource (namedDates);
@@ -2050,9 +2048,8 @@ void Task::modify (modType type, bool text_required /* = false */)
               set (name, value);
               ++modCount;
             }
-            }
-
-            catch (...) { /* NOP */ }
+            else
+              throw format ("The duration value '{1}' is not supported.", value);
           }
 
           // Need handling for numeric types, used by UDAs.