resolved unused expression warning

Author: Eric Weintraub

package-lock.json

@@ -322,7 +322,7 @@ export default class RichTextPropertyPane extends React.Component<IRichTextPrope
      * Add custom colors if passed as a property
      */
     let fontColorGroups = ["themeColors","standardColors"];
-    this.props.customColors && fontColorGroups.push('customColors');
+    if(this.props.customColors) fontColorGroups.push('customColors');
 
     return (
       <div className={styles.propertyPaneGroupField}>

src/controls/richText/RichTextPropertyPane.tsx

@@ -100,6 +100,7 @@ declare interface IControlStrings {
   ThemeColorsGroupName: string;
   HighlightColorsGroupName: string;
   StandardColorsGroupName: string;
+  ColorsGroupName: string;
   ThemeColorDarker: string;
   ThemeColorDark: string;
   ThemeColorDarkAlt: string;