Qt5 vs Qt6 assigning empty string variable QML

[shokarta]

Hello all,

I have just moved from Qt5 to Qt6, so I have ported QMAKE to CMAKE,
made lots of adjustments in the c++ files as well as QML files to fulfill qt6 requirements...

and I am stuck at the probably most basic stuff I could find :)

in Qt5 i use:

property string taskType: null

which was fine, no error or warnings...

but when i compile this in Qt6 I have the warning:

Warning: qrc:/xxxx.qml:17:31: Invalid property assignment: string expected - Assigning null to incompatible properties in QML is deprecated. This will become a compile error in future versions of Qt.

so, how do i change the string to null value?
then how do i test if the variable is null?

[sierdzio]

property string taskType: ""

// Test:
if (taskType.length === 0) {
  // something
}