The user deserves an error message in human readable form when trying to delete a bucket during rebalance...

I tried to delete a bucket while I was removing a server from my cluster. THe operation failed, and the entry contained the following entry:

Server error during processing: ["web request failed",

{path,"/pools/default/buckets/foo"}

,

{type,error}

,
{what,{case_clause,rebalance_running}},
{trace,
[

{menelaus_web_buckets, handle_bucket_delete,3}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

,

{proc_lib,init_p_do_apply,3}

]}]

and a:
Client-side error-report for user "Administrator" on node 'ns_1@10.0.0.27':
User-Agent:Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.205 Safari/534.16
Browser client XHR failure encountered. (age: 1877) Diagnostic info:
s:
xhrStatus: error,
errMsg: undefined,
statusCode: 500,
responseText:
["Unexpected server error, request logged."]