Remove trailing colon on empty evalMatches

contrib/modules/grafana.py

@@ -3,7 +3,7 @@ import json
 
 async def process(request):
 	obj = json.loads(await request.text())
-	evalMatchesStr = (': ' + ', '.join(f'{x["metric"]} = {x["value"]}' for x in obj['evalMatches'])) if 'evalMatches' in obj else ''
+	evalMatchesStr = (': ' + ', '.join(f'{x["metric"]} = {x["value"]}' for x in obj['evalMatches'])) if 'evalMatches' in obj and obj['evalMatches'] else ''
 	if 'message' in obj:
 		return f'{obj["title"]} - {obj["message"]}{evalMatchesStr}'
 	else: