util: Fix some exceptions

lib/svtplay_dl/utils.py

@@ -195,9 +195,17 @@ def subtitle_wsrt(options, data):
 def select_quality(options, streams):
     available = sorted(streams.keys(), key=int)
 
+    try:
         optq = int(options.quality)
+    except ValueError:
+        log.error("Requested quality need to be a number")
+        sys.exit(4)
     if optq:
+        try:
             optf = int(options.flexibleq)
+        except ValueError:
+            log.error("Flexible-quality need to be a number")
+            sys.exit(4)
         if not optf:
             wanted = [optq]
         else: