no errors on discisrc with no isrcs, re #51 (v2)

Discisrc displays one line for each track,
even when no ISRCs are found.

isrcsubmit.py

@@ -651,7 +651,7 @@ def gather_isrcs(backend, device):
         for line in isrcout:
             if debug:
                 printf(line)    # already includes a newline
-            if line.startswith("Track"):
+            if line.startswith("Track") and len(line) > 12:
                 m = re.search(pattern, line)
                 if m == None:
                     print("can't find ISRC in: %s" % line)