normalizeCpuUsages sometimes throw IndexOutOfBoundsException
*Created by: nkming2*
```AndroidRuntime: FATAL EXCEPTION: main
Process: com.nkming.sysusage, PID: 22089
java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.nkming.sysusage.CpuStatProvider.normalizeCpuUsages(CpuStatProvider.kt:329)
at com.nkming.sysusage.CpuStatProvider.parseCommandOutput(CpuStatProvider.kt:201)
at com.nkming.sysusage.CpuStatProvider.onCommandOutput(CpuStatProvider.kt:184)
at com.nkming.sysusage.CpuStatProvider.access$onCommandOutput(CpuStatProvider.kt:87)
at com.nkming.sysusage.CpuStatProvider$onUpdate$2.invoke(CpuStatProvider.kt:159)
at com.nkming.sysusage.CpuStatProvider$onUpdate$2.invoke(CpuStatProvider.kt:87)
at com.nkming.sysusage.ShHelper$__doShCommand$2.onCommandResult(ShHelper.kt:64)
at eu.chainfire.libsuperuser.Shell$Interactive$4.run(Shell.java:1445)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:152)
at android.app.ActivityThread.main(ActivityThread.java:5507)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
```
issue