Don't throw exception in some tests as there's no reason to

lib/android/app/src/test/java/com/reactnativenavigation/react/NavigationReactNativeHostTest.java

 public class NavigationReactNativeHostTest extends BaseTest {
 
     @Test
-    public void getPackagesDefaults() throws Exception {
+    public void getPackagesDefaults() {
         NavigationReactNativeHost uut = new NavigationReactNativeHost(RuntimeEnvironment.application, false, null);
         assertThat(uut.getPackages()).hasSize(2).extracting("class").containsOnly(MainReactPackage.class, NavigationPackage.class);
     }
 
     @Test
-    public void getPackagesAddsAdditionalPackages() throws Exception {
+    public void getPackagesAddsAdditionalPackages() {
         ReactPackage myPackage = mock(ReactPackage.class);
         NavigationReactNativeHost uut = new NavigationReactNativeHost(RuntimeEnvironment.application, false, Collections.singletonList(myPackage));
         assertThat(uut.getPackages()).hasSize(3).containsOnlyOnce(myPackage);
     }
 
     @Test
-    public void getPackages_DoesNotAddDefaultTwice() throws Exception {
+    public void getPackages_DoesNotAddDefaultTwice() {
         NavigationReactNativeHost uut = new NavigationReactNativeHost(
                 RuntimeEnvironment.application,
                 false,
-                Arrays.<ReactPackage>asList(
+                Arrays.asList(
                         new MainReactPackage(),
                         new MainReactPackage(),
                         new MainReactPackage()));