Fix Integer range widget with allowNull #6506
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The int range widget so far assigned NULL to the minimum value when allowNull was activated. This made it impossible to enter the minimum value into a range widget. This also fixes some signals which in case of a NULL value would emit a slightly-below-minimum value for double and int spinboxes. Fix qgis#18297
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Steps to reproduce:
Try to enter a value of 0
Observed behavior:
NULL appears
Expected behavior:
0 appears
See https://issues.qgis.org/issues/18297