Don't fail if the regex doesn't match.

lugito

@@ -225,7 +225,9 @@ def commithook():
                 if lpname:
                     # https://help.launchpad.net/Code/Git#Linking_to_bugs
                     regexp = re.compile(r"lp:\s+\#\d+(?:,\s*\#\d+)*")
-                    lpbugs = regexp.search(commitmessage.lower()).group(0).strip("lp: ").replace("#", "")
+                    regexpsearch = regexp.search(commitmessage.lower())
+                    if regexpsearch:
+                        lpbugs = regexpsearch.group(0).strip("lp: ").replace("#", "")
                         for bug in lpbugs.split(", "):
                             goodtask = None
                             lbug = lp.load("/bugs/"+str(bug).strip())