- If there is no package main directory, assume "empty packages".
- Catch exceptions thrown through GlobRecursive() and present a better http 500
to the user.
The packages directory tree is automatically created with the first
package creation, either from the user, or by the `_api` package.
fixes#6129
Removes verboseError from httprequest and uses
HttpUtility::GetLastParameter() instead to find out whether verbose
errors are enabled. Also parsing an invalid URL will now not lead to a
stacktrace anymore.
refs #10194
