Make it transparent in the docs that TreeUtils.getMaxTimepoint() retu…

…rn 0 in case of an empty model.

* Update javadocs and unit test accordingly

src/main/java/org/mastodon/util/TreeUtils.java

@@ -249,7 +249,9 @@ public static int getMinTimepoint( final Model model )
 	}
 
 	/**
-	 * Gets the maximum timepoint in the given {@link Model} at which at least one {@link Spot} exists in the Model.
+	 * Gets the maximum time point in the given {@link Model} at which at least one {@link Spot} exists in the Model.
+	 * <br>
+	 * If the model is empty, returns 0.
 	 * @param model the {@link Model}
 	 * @return the timepoint
 	 */

src/test/java/org/mastodon/util/TreeUtilsTest.java

@@ -191,6 +191,7 @@ public void testGetMaxTimepoint()
 	{
 		assertEquals( 3, TreeUtils.getMaxTimepoint( new ExampleGraph1().getModel() ) );
 		assertEquals( 7, TreeUtils.getMaxTimepoint( new ExampleGraph2().getModel() ) );
+		assertEquals( 0, TreeUtils.getMaxTimepoint( new Model() ) );
 	}
 
 	@Test