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Prevent Oracle from changing field.null to True
Fixed #17957 -- when using Oracle and character fields, the fields were set null = True to ease the handling of empty strings. This caused problems when using multiple databases from different vendors, or when the character field happened to be also a primary key. The handling was changed so that NOT NULL is not emitted on Oracle even if field.null = False, and field.null is not touched otherwise. Thanks to bhuztez for the report, ramiro for triaging & comments, ikelly for the patch and alex for reviewing.
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