selectAll(): make private and return empty list instead of null

• Return empty list instead of null on unexpected input (null or wrong selection type)
• Fixes NPE in setSelection()

Issue-Ref: 3545 Issue-Url: https://af3-developer.fortiss.org/issues/3545

Signed-off-by: Simon Barner barner@fortiss.org

added 1 commit

• 8f349e70 - GREEN

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merged

mentioned in commit bbe5695b