tuttlePlugin: put ChoiceLabel into the Hint as a fallback

Choice label is an ofx extension. If the host doesn't support it,
we put this information into the parameter hint.

libraries/openfxHack/Support/Library/ofxsParams.cpp

@@ -614,7 +614,28 @@ void ChoiceParamDescriptor::appendOption( const std::string& shortName, const st
     const int nCurrentValues = getProps().propGetDimension( kOfxParamPropChoiceOption );
 
     getProps().propSetString( kOfxParamPropChoiceOption, shortName, nCurrentValues );
-    getProps().propSetString( kOfxParamPropChoiceLabelOption, label, nCurrentValues, false ); // this option is optional extension, don't throw if not present.
+
+	if( ! label.empty() )
+	{
+		try
+		{
+			// this property is an optional extension.
+			getProps().propSetString( kOfxParamPropChoiceLabelOption, label, nCurrentValues );
+		} catch( std::exception& )
+		{
+			// If the kOfxParamPropChoiceLabelOption doesn't exist, we put that information into the Hint.
+			// It's better than nothing...
+			std::string hint = getProps().propGetString( kOfxParamPropHint );
+			if( ! hint.empty() )
+			{
+				hint += "\n";
+				if( nCurrentValues == 0 )
+					hint += "\n";
+			}
+			hint += shortName + ": " + label;
+			getProps().propSetString( kOfxParamPropHint, hint );
+		}
+	}
 }
 
 /** @brief set the default value */