Do not error when no versions emitted but topics are

[maxulysse]

Description of the bug

It would be nice to have a warning, when a versions is emitted, a success if a topics versions is.
And a failure when neither

cf nf-core/modules#8978

Command used and terminal output

│ bwamem2/index  │ modules/nf-core/bwamem2/in… │ Missing emit statement: tuple │
│                │                             │ val("${task.process}"),       │
│                │                             │ val('bwa-mem2'),              │
│                │                             │ eval("bwa-mem2 version 2>&1 | │
│                │                             │ tail -1"), topic: versions    │

System information

No response