Add missing parens on indent guide check

Previously the indent guide was always showing on the whitespace only lines

Closes #2274

spec/editor-view-spec.coffee

@@ -1803,6 +1803,13 @@ describe "EditorView", ->
           expect(editorView.renderedLines.find('.line:eq(10) .indent-guide').text()).toBe "#{eol}   "
           expect(editorView.renderedLines.find('.line:eq(10) .invisible-character').text()).toBe eol
 
+    describe "when editor.showIndentGuide is set to false", ->
+      it "does not render the indent guide on whitespace only lines (regression)", ->
+        editorView.attachToDom()
+        editor.setText('    ')
+        atom.config.set('editor.showIndentGuide', false)
+        expect(editorView.renderedLines.find('.line:eq(0) .indent-guide').length).toBe 0
+
   describe "when soft-wrap is enabled", ->
     beforeEach ->
       jasmine.unspy(window, 'setTimeout')

src/editor-view.coffee

@@ -1490,7 +1490,7 @@ class EditorView extends View
       position = 0
       for token in tokens
         @updateScopeStack(line, scopeStack, token.scopes)
-        hasIndentGuide = not mini and showIndentGuide and token.hasLeadingWhitespace or (token.hasTrailingWhitespace and lineIsWhitespaceOnly)
+        hasIndentGuide = not mini and showIndentGuide and (token.hasLeadingWhitespace or (token.hasTrailingWhitespace and lineIsWhitespaceOnly))
         line.push(token.getValueAsHtml({invisibles, hasIndentGuide}))
         position += token.value.length