When there's no <map-properties>, pressing enter on a feature does not handle its link, when it has a map-a

[AliyanH]

Try with the following map to see the issue:

<mapml-viewer id="map3" style="width: 500px;height: 500px;" projection="CBMTILE" zoom="2" lat="45.5052040" lon="-75.2202344" controls controlslist="geolocation">
 <layer- label="Linked feature" checked>
 <map-meta name="projection" content="CBMTILE"></map-meta> 
 <map-feature id="linkedfeature">
 <map-featurecaption>Test link</map-featurecaption>
 <map-geometry cs="gcrs">
 <map-a href="#6,-75.705278,45.39777833216"> 
 <map-point>
 <map-coordinates>-75.705278 45.397778</map-coordinates>
 </map-point>
 </map-a>
 </map-geometry>
 </map-feature>
 </layer->
</mapml-viewer>

• update the featureIndexOverlay.test test to use enter instead of click once this issue is fixed
• may be related to When there's no <map-properties> no tooltip associates to <map-featurecaption> #875, would be good to resolve these together

[yhy0217]

Resolved in #891