Fix a crash of double-free of sentence disjuncts #676
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Use free_sentence_disjuncts().
This happens when the sentence disjuncts/connectors are getting packed in a parse with null_count>0 that is done in a single call to classic_parse() (min_null_count=0 and max_null_count>0).
Avoid looping on all words and trying to free their NULL disjuncts.
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See issue #632.
At the same opportunity: