chore: do not convert boolean just to compare with null

Author: aminya

lib/adapters/code-action-adapter.ts

@@ -47,7 +47,7 @@ export default class CodeActionAdapter {
 
     const params = CodeActionAdapter.createCodeActionParams(linterAdapter, editor, range, diagnostics)
     const actions = await connection.codeAction(params)
-    if (!actions) {
+    if (actions === null) {
       return []
     }
     return actions.map((action) => CodeActionAdapter.createCodeAction(action, connection))

lib/adapters/code-highlight-adapter.ts

@@ -27,7 +27,7 @@ export default class CodeHighlightAdapter {
   ): Promise<Range[]> {
     assert(serverCapabilities.documentHighlightProvider, "Must have the documentHighlight capability")
     const highlights = await connection.documentHighlight(Convert.editorToTextDocumentPositionParams(editor, position))
-    if (!highlights) {
+    if (highlights === null) {
       return []
     }
     return highlights.map((highlight) => {

lib/adapters/outline-view-adapter.ts

@@ -38,7 +38,7 @@ export default class OutlineViewAdapter {
       connection.documentSymbol({ textDocument: Convert.editorToTextDocumentIdentifier(editor) }, cancellationToken)
     )
 
-    if (!results || results.length === 0) {
+    if (results === null || results.length === 0) {
       return {
         outlineTrees: [],
       }