fix: OnResume getLineLeft crash

[kelifu]

Modify the source code of the ScaleText class

@OverRide
public void drawFrame(Canvas canvas) {
Layout layout = mHTextView.getLayout();
if (null != layout){
········
}
}

[mark99i]

the same problem in FallText.java:67

java.lang.NullPointerException: Attempt to invoke virtual method 'float android.text.Layout.getLineLeft(int)' on a null object reference
	at com.hanks.htextview.fall.FallText$3.run(FallText.java:67)
	at android.os.Handler.handleCallback(Handler.java:789)
	at android.os.Handler.dispatchMessage(Handler.java:98)
	at android.os.Looper.loop(Looper.java:171)
	at android.app.ActivityThread.main(ActivityThread.java:6699)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)

and may be in FallText.java:102