Crash using 'math-mutate gather' in search field

[Kornel Benko]

Open a new lyx-file
select findadv dialog
in the search-field enter math
use math-mutate gather ===> crash (LASSERT (isValidBuffer()))
src/mathed/InsetMathGrid.cpp:1824

JMarc, its your game (commit 44816adce63)

	Kornel

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