Editorial: Update accname step 2E (Host Language Label) to specify empty string treatment

[rahimabdi]

Closes w3c/accname#234.

This PR clarifies that the empty string is special as part of host language label calculation.

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[spectranaut]

Also related? #2491

[scottaohara]

so i think this update helps - but per the discussion in #2491 i'm not sure if this content adequately indicates "unless .... [so stop here]" OR "unless .... [so keep going to find your accname!]

i understood it to be "so stop here" and more specifically "so stop here AND ALSO HTML AAM has more detailed guidance for images"

but maybe the conflicting wpts were contributing to the reading that the spec was actually saying 'unless ... [so move on until the tooltip step in the algorithm]"

[rahimabdi]

but maybe the conflicting wpts were contributing to the reading that the spec was actually saying 'unless ... [so move on until the tooltip step in the algorithm]"

@scottaohara Agreed, and a note pointing to HTML-AAMs somewhere in this step is a good idea. Should the note be complementary to this step, or should accname pick up in HTML-AAM after this step?

[scottaohara]

me thinks this might be solved by however @MelSumner was planning to write that note for accName in general?

i'd welcome thoughts from @sideshowbarker though

[accdc]

I think as @MelSumner described the note yesterday it makes sense to me. I approve and welcome any additional feedback as well.