[INTERNAL] Tree: Do not log null for projects with empty namespace

This is related to a change in ui5-project. The Project class now always
implements a getNamespace function, but types like ThemeLibrary or
Module return null.

Before, those types did not implement the function at all.

Author: RandomByte

lib/cli/commands/tree.js

@@ -55,7 +55,7 @@ tree.handler = async function(argv) {
 				const connectorString = lastChild ? "╰─" : "├─";
 				console.log(
 					`${baseString}${connectorString} ${chalk.bold(project.getName())} ` +
-					`${project.getNamespace ? chalk.inverse(project.getNamespace()) + " " : ""}` +
+					`${project.getNamespace() ? chalk.inverse(project.getNamespace()) + " " : ""}` +
 					chalk.dim(`(${project.getVersion()}, ${project.getType()}) `) +
 					chalk.dim.italic(`${project.getPath()}`)
 				);

test/lib/cli/commands/tree.js

@@ -108,6 +108,7 @@ test.serial("ui5 tree", async (t) => {
 		await fn({
 			project: {
 				getName: sinon.stub().returns("dependency1"),
+				getNamespace: sinon.stub().returns(null),
 				getVersion: sinon.stub().returns("1.1.1"),
 				getType: sinon.stub().returns("library"),
 				getPath: sinon.stub().returns("/home/dependency1")
@@ -117,6 +118,7 @@ test.serial("ui5 tree", async (t) => {
 		await fn({
 			project: {
 				getName: sinon.stub().returns("dependency3"),
+				getNamespace: sinon.stub().returns(null),
 				getVersion: sinon.stub().returns("3.3.3"),
 				getType: sinon.stub().returns("library"),
 				getPath: sinon.stub().returns("/home/dependency3")