Null check of ApplicationInfo.sourceDir

Fixes #1604.

Also changed back test forkEvery settings to last known working value. Slower, but works.

app/src/main/java/com/amaze/filemanager/asynchronous/loaders/AppListLoader.java

@@ -75,6 +75,9 @@ public class AppListLoader extends AsyncTaskLoader<AppListLoader.AppsDataPair> {
     mApps = new AppsDataPair(new ArrayList<>(apps.size()), new ArrayList<>(apps.size()));
 
     for (ApplicationInfo object : apps) {
+      if (object.sourceDir == null) {
+        continue;
+      }
       File sourceDir = new File(object.sourceDir);
 
       String label = object.loadLabel(packageManager).toString();

build.gradle

@@ -32,10 +32,9 @@ allprojects {
         mavenCentral()
     }
     tasks.withType(Test) {
-        maxParallelForks = 4
+        maxParallelForks = 2
         maxHeapSize = "4g"
-        forkEvery = 4
-    }
+        forkEvery = 2   }
 }
 
 spotless {