Don't silently swallow error about symbolize script not existing.

testing/test_env.py

Index: testing/test_env.py
diff --git a/testing/test_env.py b/testing/test_env.py
index 052df6769b262c442a5b8721ae38c166c659c0b8..c3dc1197567c6e00c647ad46441d1780c0b6baf7 100755
--- a/testing/test_env.py
+++ b/testing/test_env.py
@@ -155,11 +155,13 @@ def symbolize_snippets_in_json(cmd, env):
     p = subprocess.Popen(symbolize_command, stderr=subprocess.PIPE, env=env)
     (_, stderr) = p.communicate()
   except OSError as e:
-      print 'Exception while symbolizing snippets: %s' % e
+    print 'Exception while symbolizing snippets: %s' % e

[M-A Ruel, 2016/01/29 16:34:23]

print >> sys.stderr, 'Exception ...

+    raise
 
   if p.returncode != 0:
     print "Error: failed to symbolize snippets in JSON:\n"
     print stderr

[M-A Ruel, 2016/01/29 16:34:23]

print >> sys.stderr, stderr
?

+    raise subprocess.CalledProcessError(p.returncode, symbolize_command)
 
 
 def run_executable(cmd, env):