Errore

### Cause of error
```java
Exception in thread "main" java.lang.RuntimeException: Unable to start activity ComponentInfo{com.socialws.frosinone/com.owncloud.android.ui.activity.SettingsActivity}: java.lang.NullPointerException: Parameter specified as non-null is null: method com.owncloud.android.utils.theme.FilesSpecificViewThemeUtils.themePreferenceCategory, parameter category
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: Exception in thread "main" java.lang.NullPointerException: Parameter specified as non-null is null: method com.owncloud.android.utils.theme.FilesSpecificViewThemeUtils.themePreferenceCategory, parameter category
at com.owncloud.android.utils.theme.FilesSpecificViewThemeUtils.themePreferenceCategory(Unknown Source:2)
at com.owncloud.android.ui.activity.SettingsActivity.setupMoreCategory(SettingsActivity.java:331)
at com.owncloud.android.ui.activity.SettingsActivity.onCreate(SettingsActivity.java:188)
at android.app.Activity.performCreate(Activity.java:7183)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

```

### App information
* ID: `com.socialws.frosinone`
* Version: `30470000`
* Build flavor: `gplay`

### Device information
* Brand: `samsung`
* Device: `a5y17lte`
* Model: `SM-A520F`
* Id: `R16NW`
* Product: `a5y17ltexx`

### Firmware
* SDK: `26`
* Release: `8.0.0`
* Incremental: `A520FXXUGCTKA`