Address 'no scope' warning

A scope should be provided when accessing `[xml]` settings,
otherwise a warning is emitted.
This change provides `file:///` as the scope.

Fixes redhat-developer/vscode-yaml#972

Signed-off-by: David Thompson <davthomp@redhat.com>

Author: datho7561

src/languageserver/handlers/settingsHandlers.ts

@@ -40,7 +40,7 @@ export class SettingsHandler {
     const config = await this.connection.workspace.getConfiguration([
       { section: 'yaml' },
       { section: 'http' },
-      { section: '[yaml]' },
+      { section: '[yaml]', scopeUri: 'null' },
       { section: 'editor' },
       { section: 'files' },
     ]);

test/settingsHandlers.test.ts

@@ -369,7 +369,7 @@ describe('Settings Handlers Tests', () => {
       expect(workspaceStub.getConfiguration).calledOnceWith([
         { section: 'yaml' },
         { section: 'http' },
-        { section: '[yaml]' },
+        { section: '[yaml]', scopeUri: 'null' },
         { section: 'editor' },
         { section: 'files' },
       ]);
@@ -409,7 +409,7 @@ describe('Settings Handlers Tests', () => {
       expect(workspaceStub.getConfiguration).calledOnceWith([
         { section: 'yaml' },
         { section: 'http' },
-        { section: '[yaml]' },
+        { section: '[yaml]', scopeUri: 'null' },
         { section: 'editor' },
         { section: 'files' },
       ]);