[tracker-miners/sam/functional-tests] functional-tests: Reduce noise on failed extractor tests

[Sam Thursfield <sthursfield src gnome org>]

commit 67216fe648e5d8a467985a50621930f69d570a56
Author: Sam Thursfield <sam afuera me uk>
Date:   Tue Jul 17 12:28:40 2018 +0200

    functional-tests: Reduce noise on failed extractor tests

 tests/functional-tests/400-extractor-metadata.py | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)
---
diff --git a/tests/functional-tests/400-extractor-metadata.py 
b/tests/functional-tests/400-extractor-metadata.py
index de1fda36f..aeff2e812 100755
--- a/tests/functional-tests/400-extractor-metadata.py
+++ b/tests/functional-tests/400-extractor-metadata.py
@@ -237,10 +237,13 @@ def run_one (filename):
     sys.exit(not result.wasSuccessful())
 
 
-if len(sys.argv) == 2:
-    run_one (sys.argv[1])
-elif len(sys.argv) == 1:
-    run_all ()
-else:
-    sys.stderr.write("Too many arguments.")
+try:
+    if len(sys.argv) == 2:
+        run_one (sys.argv[1])
+    elif len(sys.argv) == 1:
+        run_all ()
+    else:
+        raise RuntimeError("Too many arguments.")
+except RuntimeError as e:
+    sys.stderr.write("ERROR: %s\n" % e)
     sys.exit(1)