Prevent empty nodes to render expand icon

[pditommaso]

There's a minor inconsistency in the collapsible tree view rendered in the inspect page.

In some cases empty nodes are rendered with a plus icon even if there's no content, instead of being disabled (see below).

Likely this happens because there's empty object associated with it

[pditommaso]

Link to validate it https://wave.seqera.io/view/inspect?image=oras://community.wave.seqera.io/library/bwa:0.7.18--07d074a4d1589c42

[pditommaso]

This is still happening, check for example "annotations" here

[munishchouhan]

This is still happening, check for example "annotations" here

ok, i will look into it

[munishchouhan]

PR to fix this issue:
#706