[FIX] VectorizationComputeValue - fix unpickling old pickles #904
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Issue
Before the orange3-text version, the 1.12.0 VectorizationComputeValue's variable was wrongly set to a current
variable (a variable that has this compute value attached) instead of
the original variable, which caused failure after the latest changes in core
Orange. It was fixed in #900.
Anyway, it is still set in pickles created before 1.12.0.
Description of changes
Remove the variable when unpickling VectorizationComputeValue.
Includes