[JW Lua] Crash of Finale with an empty FCTextExpressionDef

[Jan Angermüller]

Jari,

I noticed that this simple code crashes Finale:
local textexprdef=finale.FCTextExpressionDef()
textexprdef:Load(1000)  --load non-existing text expression
textexprdef:CreateTextString()

Of course, it's the developer's fault to not check textexprdef for nil,
but a crash of Finale is not what I would expect to happen.

Best,
Jan
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