Fix expose revert inserting literal 'NULL' string into database#71
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MySQL batch mode (-N -B) outputs SQL NULL values as the literal string "NULL". The expose state save captured this string verbatim, and the revert then executed SET value='NULL' instead of SET value=NULL, corrupting base_static_url and base_media_url config entries. Track NULL values with an IsNull flag on savedConfigRow and generate unquoted NULL in the revert SQL when the original value was NULL.
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MySQL batch mode (-N -B) outputs SQL NULL values as the literal string "NULL". The expose state save captured this string verbatim, and the revert then executed SET value='NULL' instead of SET value=NULL, corrupting base_static_url and base_media_url config entries.
Track NULL values with an IsNull flag on savedConfigRow and generate unquoted NULL in the revert SQL when the original value was NULL.