Ignore invalid properties like empty GEO: (#82)

* Updated ical4j to `3.2.9`

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Enabled suppress invalid properties

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Added test with event with invalid property

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Changed invalid geo test ical

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Removed trailing comma

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Removed old comment

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Compressed `invalid-geo.ics` into `testFromReader_invalidProperty`

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Add comment for test

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Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>
Co-authored-by: Ricki Hirner <hirner@bitfire.at>