erica clone fails

```
$ erica clone http://localhost:5984/paste/_design/paste
==> paste (clone)
ERROR: clone failed while processing /home/damjan/my-work/paste: {'EXIT',
{function_clause,
[{dict,'-from_list/1-fun-0-',
[insecure,
{dict,0,16,16,8,80,48,
{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},
{{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]}}}],
[{file,"dict.erl"},{line,111}]},
{lists,foldl,3,[{file,"lists.erl"},{line,1262}]},
{couchbeam_util,propmerge,3,
[{file,"src/couchbeam_util.erl"},{line,109}]},
{couchbeam,open_db,3,[{file,"src/couchbeam.erl"},{line,358}]},
{erica_util,parse_couchapp_url,2,
[{file,"src/erica_util.erl"},{line,124}]},
{erica_clone,clone1,3,[{file,"src/erica_clone.erl"},{line,30}]},
{erica_core,run_modules,4,[{file,"src/erica_core.erl"},{line,98}]},
{erica_core,execute,4,[{file,"src/erica_core.erl"},{line,68}]}]}}
```

Reproduce the shown erica clone command, then start at src/erica_util.erl line 124 and follow the call into couchbeam_util.erl line 109 and couchbeam.erl line 358. Confirm the cause of the dict:from_list/1 failure and verify that cloning the CouchDB design document completes without the reported error.

Written by the indexing model from the issue text.