Text in tooltips that's displayed only if needed

[ilgaspa]

I have two digicams: one stores ISO data in the standard field, whilst the other uses a proprietary one. In tooltips I set the ISO value to be shown as follows

ISO:<ISO>

but this results in the word ISO: appearing even if the image has no iso data... perhaps a syntax like foobar's one, something like

[ISO: <ISO>]

would be useful... the "ISO:" string should be displayed only if the <ISO> tag has exists

[xnview]

I have two digicams: one stores ISO data in the standard field, whilst the other uses a proprietary one. In tooltips I set the ISO value to be shown as follows

ISO:<ISO>

but this results in the word ISO: appearing even if the image has no iso data... perhaps a syntax like foobar's one, something like

[ISO: <ISO>]

would be useful... the "ISO:" string should be displayed only if the <ISO> tag has exists

Yes, currently it's a problem if info doesn't exist.
[] is not good because is used often.
But one delimiter between the text is a good idea $ISO:<ISO>$