Do not override http_phrase unless passed to Frapi_Error constructor.
Do not override http_phrase unless passed to Frapi_Error constructor.

This fixes a bug that was causing the http phrase in a known error, that
had an http phrase defined to be overridden if it was a standard error code, or
if there was an error message. It now is only overwritten if an http phrase is
passed to the Frapi_Error constructor.

winlolo/frapi,frapi/frapi,trevormorse/frapi,winlolo/frapi,nslod/frapi,nslod/frapi,nslod/frapi,winlolo/frapi,trevormorse/frapi,frapi/frapi,trevormorse/frapi,frapi/frapi,trevormorse/frapi,nslod/frapi,winlolo/frapi,frapi/frapi