fix bug to return empty array when no config exists (#642)

Author: eleanorjboyd

src/extension/debugger/configuration/launch.json/launchJsonReader.ts

@@ -51,7 +51,8 @@ export function getConfigurationsFromSettings(workspace: WorkspaceFolder): Debug
         !Array.isArray(codeWorkspaceConfig.configurations) ||
         codeWorkspaceConfig.configurations.length === 0
     ) {
-        throw Error('No configurations found in launch.json or settings.json');
+        traceLog('No configurations found in settings.json or launch.json.');
+        return [];
     }
     traceLog('Using configuration in workspace settings.json.');
     return codeWorkspaceConfig.configurations;

src/test/unittest/configuration/launch.json/launchJsonReader.unit.test.ts

@@ -96,7 +96,7 @@ suite('Debugging - launchJsonReader', () => {
             assert.strictEqual(configurations[0].name, 'Launch Program 3');
         });
 
-        test('Should error if no configurations in settings.json', () => {
+        test('Should return empty array if no configurations in settings.json', () => {
             const workspace = typemoq.Mock.ofType<WorkspaceFolder>();
             workspace.setup((w) => w.uri).returns(() => Uri.file('/path/to/workspace'));
 
@@ -106,11 +106,8 @@ suite('Debugging - launchJsonReader', () => {
 
             sandbox.stub(vscodeapi, 'getConfiguration').returns(mockConfig.object);
 
-            assert.throws(
-                () => getConfigurationsFromSettings(workspace.object),
-                Error,
-                'No configurations found in launch.json or settings.json',
-            );
+            const configurations = getConfigurationsFromSettings(workspace.object);
+            assert.strictEqual(configurations.length, 0);
         });
     });
 });