Skip emebedding test data when there is no target

On android test data is embedded into to the binary via resources. This
will not work with sourceless tests such as the qml only test cases.

Change-Id: I3ecf28223b3c7c6dae4ca3f15519adc028082598
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Qt CMake Build Bot

cmake/QtBuild.cmake

@@ -2322,6 +2322,8 @@ function(add_qt_test name)
     endif()
 
     if(builtin_testdata)
+        # Safe guard against qml only tests, no source files == no target
+        if (TARGET "${name}")
             target_compile_definitions("${name}" PRIVATE BUILTIN_TESTDATA)
 
             foreach(testdata IN LISTS arg_TESTDATA)
@@ -2341,6 +2343,7 @@ function(add_qt_test name)
                     FILES ${builtin_files}
                     BASE ${CMAKE_CURRENT_SOURCE_DIR})
             endif()
+        endif()
     else()
         # Install test data
         file(RELATIVE_PATH relative_path_to_test_project