Ensure that published items aren't null

app/src/main/java/acr/browser/lightning/search/SuggestionsAdapter.java

@@ -42,6 +42,7 @@ import acr.browser.lightning.database.BookmarkManager;
 import acr.browser.lightning.database.HistoryItem;
 import acr.browser.lightning.database.HistoryModel;
 import acr.browser.lightning.preference.PreferenceManager;
+import acr.browser.lightning.utils.Preconditions;
 import acr.browser.lightning.utils.ThemeUtils;
 
 public class SuggestionsAdapter extends BaseAdapter implements Filterable {
@@ -264,6 +265,7 @@ public class SuggestionsAdapter extends BaseAdapter implements Filterable {
             .subscribe(new SingleOnSubscribe<List<HistoryItem>>() {
                 @Override
                 public void onItem(@Nullable List<HistoryItem> item) {
+                    Preconditions.checkNonNull(item);
                     publishResults(item);
                 }
             });

app/src/main/java/acr/browser/lightning/utils/DrawableUtils.java

@@ -1,7 +1,5 @@
 package acr.browser.lightning.utils;
 
-import android.content.Context;
-import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Paint;
@@ -11,10 +9,8 @@ import android.graphics.RectF;
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
-import android.support.annotation.AttrRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
-import android.util.TypedValue;
 import android.view.View;
 
 public class DrawableUtils {