"No significant hits found" message (dev branch)

[steffenlem]

Description of the bug

When there are no significant hits after FDR filtering, the metadata of the file so no longer printed. The output prints "null" for the sample metadata. This was seen on the current dev branch.

https://github.com/nf-core/mhcquant/blob/840d4d740eb54fc22c5b526da73b528916311626/workflows/mhcquant.nf#L312

Command used and terminal output

No response

Relevant files

No response

System information

No response