fix(parser/clangtidy): skip empty category

examples/clangtidy/sillycode

@@ -1 +1 @@
-Subproject commit a3e3c533c8f986168a6b1a8621ce4034fd4eda04
+Subproject commit 13fe8890f87cd68125c48c19e1f9d4a21bc21383

internal/parser/clangtidy/score.go

@@ -25,6 +25,10 @@ func GetResult(jsonMessages []JsonMessage, conf Conf) (int, string) {
 			parts := strings.Split(checkName, "-")
 			if len(parts) > 0 {
 				category := parts[0]
+				// checkName might be: -warnings-as-errors
+				if category == "" {
+					continue
+				}
 				categoryCount[category] += 1
 			}
 		}