Fix 'info' command fail when there are no builds

Fixes #44

Author: radomirbosak

jenkins_cli/cli.py

@@ -175,8 +175,8 @@ def info(self, args):
         job_info = self.jenkins.get_job_info(job_name, 1)
         if not job_info:
             job_info = {}
-        last_build = job_info.get('lastBuild', {})
-        last_success_build = job_info.get('lastSuccessfulBuild', {})
+        last_build = job_info.get('lastBuild') or {}
+        last_success_build = job_info.get('lastSuccessfulBuild') or {}
         xml = self.jenkins.get_job_config(job_name)
         root = ElementTree.fromstring(xml.encode('utf-8'))
         scm_name, branch_node = self._get_scm_name_and_node(root)