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Fix Virtual layers display with empty subsetstring

Fixes #19721

Virtual layers incorrectly show no feature when the expression filter string is empty, instead of correctly showing all the features.

Subset string needs to be tested against Empty instead of Null in order to correctly populate the wheres list and prepare a well formed SQL query string.

(cherry picked from commit 99696b6)
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agiudiceandrea authored and nyalldawson committed Aug 28, 2018
1 parent 60fed67 commit 0521bfc0927aa27d4932d96f2441d8d930615637
Showing with 1 addition and 1 deletion.
  1. +1 −1 src/providers/virtual/qgsvirtuallayerfeatureiterator.cpp
@@ -65,7 +65,7 @@ QgsVirtualLayerFeatureIterator::QgsVirtualLayerFeatureIterator( QgsVirtualLayerF
QStringList wheres;
QString offset;
QString subset = mSource->mSubset;
if ( !subset.isNull() )
if ( !subset.isEmpty() )
wheres << subset;

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