Recipe for LyX crash with master-child docs

[Andrew Parsloe]

Given master.lyx and child.lyx (which can be blank or contain text).
1. Open child.lyx
2. Save under a different name -- say test.lyx
3. In test.lyx clear the master dependency (Document>Settings>Document 
Class)
4. Compile to pdf

LyX 2.0.2 crashes (at least under Windows Vista)
LyX 2.0.1 does not.

If steps 2. & 3. are interchanged, clearing the master dependency in 
child.lyx then renaming as test.lyx & compiling, there is no crash.

Andrew