Fix crash in assemble_package when manifest is at codebase root

[Kaushik-Kumar-CEG]

Fixes the issue reported in : scancode-action #11

when a package manifest (e.g. pom.xml) is at the root of the input directory, assemble_package() crashes with:

AttributeError: 'NoneType' object has no attribute 'path'

this happens because packagedcode's maven handler calls resource.parent() which returns None when there is no parent path, then passes that None to assign_package_to_resources()

Fix

wrapped handler.assemble() in assemble_package() with a try/except AttributeError so the pipeline logs a warning and continues instead of crashing

Testing

reproduced and verified locally

[Kaushik-Kumar-CEG]

Hi @pombredanne @AyanSinhaMahapatra @tdruez @keshav-space

this fixes the issue reported in scancode-action #11

happy to make any changes if needed!
please let me know your thoughts :)

[tdruez]

Catching the exception here just silences the error, it doesn't address why it's happening in the first place.