Fix 'stop' command fail when there are no builds

Author: radomirbosak

jenkins_cli/cli.py

@@ -247,8 +247,9 @@ def builds(self, args):
     def stop(self, args):
         job_name = self._check_job(args.job_name)
         info = self.jenkins.get_job_info(job_name, 1)
-        build_number = info['lastBuild'].get('number')
-        if build_number and info['lastBuild'].get('building'):
+        last_build = info.get('lastBuild') or {}
+        build_number = last_build.get('number')
+        if build_number and last_build.get('building'):
             stop_status = self.jenkins.stop_build(job_name, build_number)
             print("%s: %s" % (job_name, 'stopped' if not stop_status else stop_status))
         else: