[android] Fix style code generation if array default value is missing

platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/SymbolLayerTest.java

@@ -598,7 +598,7 @@ public class SymbolLayerTest extends BaseLayerTest {
     assertNull(layer.getTextVariableAnchor().getValue());
 
     // Set and Get
-    String[] propertyValue = [undefined];
+    String[] propertyValue = new String[0];
     layer.setProperties(textVariableAnchor(propertyValue));
     assertEquals(layer.getTextVariableAnchor().getValue(), propertyValue);
   }

platform/android/scripts/generate-style-code.js

@@ -198,7 +198,11 @@ global.defaultValueJava = function(property) {
              switch (property.value) {
               case 'string':
               case 'enum':
-                return '[' + property['default'] + "]";
+                if (property['default'] !== undefined) {
+                    return '[' + property['default'] + ']';
+                } else {
+                    return 'new String[0]';
+                }
               case 'number':
                 var result ='new Float[] {';
                 for (var i = 0; i < property.length; i++) {