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fix bug for null object reference #4

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java.lang.RuntimeException: Unable to start activity ComponentInfo{com.psaravan.filebrowserview.demo/com.psaravan.filebrowserview.demo.ListActivity.ListActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.HashMap com.psaravan.filebrowserview.lib.FileBrowserEngine.FileExtensionFilter.getFilterMap()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2460)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2522)
at android.app.ActivityThread.access$800(ActivityThread.java:167)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1417)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:179)
at android.app.ActivityThread.main(ActivityThread.java:5543)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:956)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.HashMap com.psaravan.filebrowserview.lib.FileBrowserEngine.FileExtensionFilter.getFilterMap()' on a null object reference
at com.psaravan.filebrowserview.lib.FileBrowserEngine.FileBrowserEngine.loadDir(FileBrowserEngine.java:135)
at com.psaravan.filebrowserview.lib.ListLayout.ListLayoutView.showDir(ListLayoutView.java:82)
at com.psaravan.filebrowserview.lib.ListLayout.ListLayoutView.init(ListLayoutView.java:65)
at com.psaravan.filebrowserview.lib.View.FileBrowserView.init(FileBrowserView.java:134)
at com.psaravan.filebrowserview.demo.ListActivity.ListActivity.onCreate(ListActivity.java:58)
at android.app.Activity.performCreate(Activity.java:5975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2522) 
at android.app.ActivityThread.access$800(ActivityThread.java:167) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1417) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:179) 
at android.app.ActivityThread.main(ActivityThread.java:5543) 
at java.lang.reflect.Method.invoke(Native Method) 

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java.lang.RuntimeException: Unable to start activity ComponentInfo{com.psaravan.filebrowserview.demo/com.psaravan.filebrowserview.demo.ListActivity.ListActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.HashMap com.psaravan.filebrowserview.lib.FileBrowserEngine.FileExtensionFilter.getFilterMap()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2460)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2522)
at android.app.ActivityThread.access$800(ActivityThread.java:167)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1417)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:179)
at android.app.ActivityThread.main(ActivityThread.java:5543)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:956)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.HashMap com.psaravan.filebrowserview.lib.FileBrowserEngine.FileExtensionFilter.getFilterMap()' on a null object reference
at com.psaravan.filebrowserview.lib.FileBrowserEngine.FileBrowserEngine.loadDir(FileBrowserEngine.java:135)
at com.psaravan.filebrowserview.lib.ListLayout.ListLayoutView.showDir(ListLayoutView.java:82)
at com.psaravan.filebrowserview.lib.ListLayout.ListLayoutView.init(ListLayoutView.java:65)
at com.psaravan.filebrowserview.lib.View.FileBrowserView.init(FileBrowserView.java:134)
at com.psaravan.filebrowserview.demo.ListActivity.ListActivity.onCreate(ListActivity.java:58)
at android.app.Activity.performCreate(Activity.java:5975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2522) 
at android.app.ActivityThread.access$800(ActivityThread.java:167) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1417) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:179) 
at android.app.ActivityThread.main(ActivityThread.java:5543) 
at java.lang.reflect.Method.invoke(Native Method) 

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