`tns run android` appends to .bash_profile/.zprofile even if denied for local build configuration

Environment

• CLI: 6.1.2
• Cross-platform modules: 6.0.7
• Android Runtime: 6.1.2
• iOS Runtime: 6.1.1
• Plugin(s): -

Describe the bug
When running tns run android and if the environment is not properly set up, the automatic environment setup script for a local build will automatically append JAVA_HOME and ANDROID_HOME, as well as ANDROID_SDK_ROOT to .bash_profile / .zprofile even if install steps 3 and 4 are rejected.

This happens every time the installer is run up to these steps which leads to a spammed .bash_profile / .zprofile if the installer needs to be aborted or restarted a couple of times. This will also overwrite previously set variables.

The output of the cli is as follows:

Step 3 of 12:
Allow the script to install Open JDK 8?
(Y)es/(N)o
n
You have chosen not to install Open JDK 8. Some features of NativeScript may not work correctly if you haven't already installed it
Set JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
Step 4 of 12:
Allow the script to install Android SDK?
Note that if you type all you won't be prompted for subsequent installations
(Y)es/(N)o/(A)ll
n
You have chosen not to install Android SDK. Some features of NativeScript may not work correctly if you haven't already installed it
Set ANDROID_HOME=/usr/local/share/android-sdk
Set ANDROID_SDK_ROOT=/usr/local/share/android-sdk
Configuring your system for Android development... This might take some time, please, be patient.
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration

To Reproduce

1. Have an incomplete environment set up (e.g. do not have ANDROID_HOME as environment variable set)
2. run tns run android in your project
3. choose configure local build
4. deny all steps 3 and 4
5. check .bashprofile / .zprofile

Expected behavior
Have the setup script not append variables in .bashprofile / .zprofile or replace the variables if installation steps 3 and 4 are rejected.

Additional context
My .bash_profile after I had to retry the installer a couple of times:

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export ANDROID_HOME=/usr/local/share/android-sdk
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export ANDROID_HOME=/usr/local/share/android-sdk
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export ANDROID_HOME=/usr/local/share/android-sdk
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export ANDROID_HOME=/usr/local/share/android-sdk
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk

tns run android CLI フローと、configure local build で使用される自動環境セットアップから始め、ステップ 3 と 4 を拒否しながらプロンプトシーケンスを再現します。JAVA_HOME、ANDROID_HOME、ANDROID_SDK_ROOT が .bash_profile または .zprofile に書き込まれるタイミングを追跡します。完了条件は、拒否されたインストール手順によって、再試行を繰り返した後もこれらの変数が追加も置換もされないことです。