Prevent deltas having empty strings as WKT geometry

[suricactus]

For some reason a geometryless layer would produce WKTs that are empty strings. Did not manage to reproduce locally, but this later fails in posgres, as ST_GeomFromText( '' ) raises.

Related PR: opengisch/QFieldCloud#917
Fix: #4796

[duke-nyuki]

Task linked: QF-3987 Prevent QField to generate an empty string geometry WKT

[qfield-fairy]

🎉 Ta-daaa, freshly created APKs are available for cc7bc98: arm64-android

Other architectures

• arm-neon-android
• x64-android
• x86-android
• all access arm64-android
• all access arm-neon-android
• all access x64-android
• all access x86-android

[nirvn]

I assume we don't care about distinguishing null vs empty?

[suricactus]

I pushed a wrong version with ignoring the empty geom. I would prefer we support empty geom.

However, is it possible to create empty geom in QField?

[nirvn]

@suricactus , at the moment it is not possible to create null geometries in QGIS (and therefore QField). And it's not something that'll happen tomorrow (@m-kuhn can attest, he tried :) ).

That said, it's definitely something that might become relevant in QGIS in the future. Several formats do differentiate null vs empty.

[suricactus]

Thanks for the clarification. At least now we know QFieldCloud is empty geometry friendly as of today, I have tested POINT EMPTY and it works like a charm in the rest of the infrastructure.