hg: run-tests: treat a parse error as return code 1

Summary:
previously, unexpected output would cause the harness to
stack trace and not show the actual test failure.

This catches the error and treats it as a failed run, which causes
the test output to be displayed.

No more `ValueError: invalid literal for int() with base 10: '0\xe2\x90\x8a'`

Reviewed By: DurhamG

Differential Revision: D13995000

fbshipit-source-id: 5c1a9e8d6f8e81a924cdbf760fa75cdc0d33b74d

tests/run-tests.py

@@ -2000,7 +2000,10 @@ class TTest(Test):
 
             if lcmd:
                 # Add on last return code.
-                ret = int(lcmd.split()[1])
+                try:
+                    ret = int(lcmd.split()[1])
+                except ValueError:
+                    ret = 1
                 if ret != 0:
                     postout.append(b"  [%d]\n" % ret)
                 if pos in after: