Fix #4341: Use correct logging and hide private Methods as fake data types

[vdwals]

1. NullPointer Exception fix: Changed logging from log.error() to logError() since log is not available in FakeMeta.class.

2. Fix reason for error log: When generating the available Options in FakeDialog.class, private Methods are listed as well. This results into the option, to select a private message and the error, that this method can not be called or is not available. Therefore I added a filter to exclude private Methods from the list of fake topics.

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[hansva]

Thanks @vdwals !

[hansva]

A small fyi. You can assign tickets to yourself using the same command we use.
This way we know when you will be working on it.