hotfix: glaring mistake while parsing text runs

ythdd_struct_parser.py

@@ -471,7 +471,7 @@ def extractTextFromSimpleOrRuns(obj: dict, default: str = "") -> str:
 	# Extracts the text both from "runs" and "simpleText"
 	# with failsafe to default.
 	text = default
-	if not isinstance(obj, str):
+	if not isinstance(obj, dict):
 		return default
 	if "runs" in obj:
 		text = runsToText(obj["runs"])