Handle null bundlePaths in FlutterRunArguments (flutter#7161)

Author: jason-simmons

shell/platform/android/io/flutter/view/FlutterNativeView.java

@@ -76,15 +76,16 @@ public void assertAttached() {
     }
 
     public void runFromBundle(FlutterRunArguments args) {
-        if (args.bundlePath == null && args.bundlePaths.length == 0) {
+        boolean hasBundlePaths = args.bundlePaths != null && args.bundlePaths.length != 0;
+        if (args.bundlePath == null && !hasBundlePaths) {
             throw new AssertionError("Either bundlePath or bundlePaths must be specified");
         } else if ((args.bundlePath != null || args.defaultPath != null) &&
-                args.bundlePaths.length != 0) {
+                hasBundlePaths) {
             throw new AssertionError("Can't specify both bundlePath and bundlePaths");
         } else if (args.entrypoint == null) {
             throw new AssertionError("An entrypoint must be specified");
         }
-        if (args.bundlePaths.length != 0) {
+        if (hasBundlePaths) {
             runFromBundleInternal(args.bundlePaths, args.entrypoint, args.libraryPath);
         } else {
             runFromBundleInternal(new String[] {args.bundlePath, args.defaultPath},