Crash removing Format

[Kornel Benko]

Following lead to crash:

	1. Create new file-Format (for instance Epub, define a viewer)
	2. define conversion for docbook-xls -> Epub
	3. restart lyx
	4. remove the new conversion
	5. remove the format Epub --> crash

There is no crash if
	5. restart lyx
	6. remove the format Epub

	Kornel

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