Fix TypeAssert nil dereference bug#54
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bagnalla wants to merge 1 commit intoReconfigureIO:masterfrom
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The following is a valid Go program that will cause goblin to segfault:
It happens because a TypeAssertExpr's Type field may be nil (spec). This PR fixes the issue by replacing the use of 'DumpExprAsType' with 'AttemptExprAsType' for this field.