Qt6LinguistTool CMake Policy CMP0007 not met

When running the Linguist Tools in my CMake script it constantly give this warning which I seemingly cannot influence. 
I have already added 3rd party libs to be excluded from the translation. But It seems that this error is due to the Qt libs itself.

# Setup Translator tool 
qt_add_translations(myApp
     TS_FILE_BASE translating-qml
     TS_FILE_DIR ./lang
     LRELEASE_OPTIONS -idbased
 )

# exclude 3rd party libs
set_property(TARGET myApp
    PROPERTY QT_EXCLUDE_SOURCES_FROM_TRANSLATION
    ${3rdParty1}
    ${3rdParty2_SOURCE_DIR}
)

From what I get it is just throwing this warning because of an empty element in the list -> ;;  in the last line