fix initial instructions for git

rhodecode/templates/shortlog/shortlog_data.html

@@ -73,7 +73,7 b''
     ${c.rhodecode_repo.alias} clone ${c.clone_repo_url}
     ${c.rhodecode_repo.alias} add README # add first file
     ${c.rhodecode_repo.alias} commit -m "Initial" # commit with message
-    ${c.rhodecode_repo.alias} push # push changes back
+    ${c.rhodecode_repo.alias} push ${'origin master' if h.is_git(c.rhodecode_repo) else ''} # push changes back
 </pre>
 
 <h4>${_('Existing repository?')}</h4>