Distance to MultiPolygon with empty component crashes GEOS

[mdavis]

The distance computation crashes if an argument is a geometry collection with an empty component. For example,

MULTIPOLYGON (EMPTY, ((98 200, 200 200, 200 99, 98 99, 98 200)))

This was reported as GEOS ​GH 295.

JTS fails as well. A fix is in JTS ​PR 524

[strk]

Also reported as #1065 - I'll update the fix to follow JTS path

[Sandro Santilli <strk@…>]

In 572a212/git:

Update last port info for ConnectedElementLocationFilter

Verify reported crash in distance op is under test.
Closes #1023