TW-253

- Added details in debug mode, for unrecognized data (thanks to Kosta H).
  Note: does not close TW-253.

src/Task.cpp

@@ -854,6 +854,11 @@ void Task::parseLegacy (const std::string& line)
     break;
 
   default:
+    std::stringstream message;
+    message << "Invalid fileformat at line '"
+            << line
+            << "'";
+    context.debug (message.str());
     throw std::string (STRING_TASK_PARSE_UNREC_FF);
     break;
   }