Plain text and richtext mixed in same cell can be read

This was introduced in 0084776

Fixes #442
Closes #453

Author: gintsmurans

CHANGELOG.md

@@ -60,6 +60,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Constant `TYPE_DOUGHTNUTCHART` is now `TYPE_DOUGHNUTCHART`.
 
+## [Unreleased]
+
+### Fixed
+
+- Plain text and richtext mixed in same cell can be read - [#442](https://github.com/PHPOffice/PhpSpreadsheet/issues/442)
+
 ## [1.0.0-beta2] - 2017-11-26
 
 ### Added

src/PhpSpreadsheet/Reader/Xlsx.php

@@ -2068,7 +2068,9 @@ private function parseRichText($is)
         } else {
             if (is_object($is->r)) {
                 foreach ($is->r as $run) {
-                    if (isset($run->rPr)) {
+                    if (!isset($run->rPr)) {
+                        $value->createText(StringHelper::controlCharacterOOXML2PHP((string) $run->t));
+                    } else {
                         $objText = $value->createTextRun(StringHelper::controlCharacterOOXML2PHP((string) $run->t));
 
                         if (isset($run->rPr->rFont['val'])) {