removed "undefined" color

src/widgets/contact.jsx

@@ -83,7 +83,8 @@ class Contact extends React.Component {
       this.props.comment;
 
     const icon = deliveryMarker(this.props.received);
-    const marker = icon ? <i className={'material-icons small space-right ' + icon.color}>{icon.name}</i> : null;
+    const marker = icon ? <i className={'material-icons small space-right' +
+      (icon.color ? ' ' + icon.color : '')}>{icon.name}</i> : null;
 
     return (
       <li className={!this.props.showCheckmark && this.props.selected ? 'selected' : null} onClick={this.handleClick}>

umd/index.dev.js

@@ -7842,7 +7842,7 @@ class Contact extends (react__WEBPACK_IMPORTED_MODULE_0___default().Component) {
     const subtitle = this.props.preview ? typeof this.props.preview == 'string' ? this.props.preview : react__WEBPACK_IMPORTED_MODULE_0___default().createElement((react__WEBPACK_IMPORTED_MODULE_0___default().Fragment), null, tinode_sdk__WEBPACK_IMPORTED_MODULE_6__.Drafty.format(this.props.preview, draftyFormatter, this)) : this.props.comment;
     const icon = (0,_lib_utils_js__WEBPACK_IMPORTED_MODULE_7__.deliveryMarker)(this.props.received);
     const marker = icon ? react__WEBPACK_IMPORTED_MODULE_0___default().createElement("i", {
-      className: 'material-icons small space-right ' + icon.color
+      className: 'material-icons small space-right' + (icon.color ? ' ' + icon.color : '')
     }, icon.name) : null;
     return react__WEBPACK_IMPORTED_MODULE_0___default().createElement("li", {
       className: !this.props.showCheckmark && this.props.selected ? 'selected' : null,