Fixed chromite shell to report python errors

bin/chromite

Index: bin/chromite
diff --git a/bin/chromite b/bin/chromite
index 48b09070c3b658c8867ce211d73e0bd987606234..9c37e6f2b154e9cd2c33227fb643786bec391cb0 100755
--- a/bin/chromite
+++ b/bin/chromite
@@ -55,6 +55,13 @@ for path in Search(os.getcwd()):
     import chromite.shell.main
     break
   except ImportError, e:
+    # Just in case there is actually something wrong with Chromite, print
+    # a sensible error. We match only the end of the string so that we can
+    # handle an error within the chromite directory.
+    # The full error is 'No module named (chromite.)shell.main'

[diandersAtChromium, 2011/02/09 19:46:01]

Simon: can you give me an example of the error string where the [-10:] would
matter?  In other words: what is the error message that inspired the check only
for the last 10 characters?

+    if str(e) [-10:] != 'shell.main':
+      raise
+
     # We've got different modules named chromite in the tree, pulling in the
     # wrong one will break the right one.  So unload it.
     if 'chromite' in sys.modules: