fix: prevent prefixing null/empty string #3233
Merged
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This is a bug fix to this recently merged PR: #3227
QueryDataTable::getTablePrefix() returns string or null. It causes an issue to QueryDataTable::addTablePrefix() method where in it returns a column name with a null/empty prefix (.column_name) instead of (prefix.column_name).
I added a guard clause to check if the table prefix returned by QueryDataTable::getTablePrefix() is not null/empty string before prefixing it to the column.