I have this if else statement if the condition is true the if statement executed but if the condition is false the else statement not executed

steps{
                script{
                    echo '*Stage3 - Trying to build python program and export the Artifact*'
                    pyInstallerOutput = bat(returnStdout: true, script: '@python -m PyInstaller -v').trim()
                    if(!("$pyInstallerOutput".contains('No module named'))){
                        echo "  PyInstaller Version: $pyInstallerOutput is up and running. good! building artifact"
                        directoryName = bat(returnStdout: true,script: '@echo