Added another guard against varying pyang output format.

- Legacy-Id: 10966

ietf/submit/checkers.py

@@ -142,6 +142,8 @@ class DraftYangChecker(object):
             if code > 0:
                 error_lines = err.splitlines()
                 for line in error_lines:
+                    if line.strip():
+                        try:
                             fn, lnum, msg = line.split(':', 2)
                             lnum = int(lnum)
                             if fn == model and (lnum-1) in range(len(text)):
@@ -153,6 +155,8 @@ class DraftYangChecker(object):
                                 errors += 1
                             if 'warning: ' in msg:
                                 warnings += 1
+                        except ValueError:
+                            pass
             results[model] = {
                 "passed":  code == 0,
                 "message": out+"No validation errors\n" if code == 0 else err,