MH-10402, Fix NullPointerException in Ingest Endpoint

Omitting the `mediaPackage` parameter in the /ingest/ingest endpoint
caused a NullPointerException. This patch will fix that problem and
return a `400 Bad Request` instead.

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
MH-10402, Improved log message

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
Merged in lkiesow/matterhorn/t/MH-10402-ingest-nullpointer-exception (pull request #283)

MH-10402, Fix NullPointerException in Ingest Endpoint
MH-10404 [Bugfix] Fixed autocreate of series exception on upload dialog
Merge 'opencast/t/MH-10404-series-autocreate' into r/1.5.0

After uploading a recording with entering a new series, the ingest
failed with the message “Could not get Series Catalog”. This patch fixes
this problem.

Signed-off-by: Lars Kiesow <lkiesow@uos.de>