Update Font.php - Fix Extra Space

Now that Font isn't returning unnecessary values, it could sometimes occur where it returned an extra space in the document if ($content == ''). This is fixed.

Author: rasamassen

src/PhpWord/Writer/RTF/Style/Font.php

@@ -117,6 +117,10 @@ public function write()
         // Other (Font settings currently not in included in array)
         $content .= $this->getValueIf($style->isNoProof(), '\noproof');
         $content .= $this->getValueIf($style->getBgColor() !== null, '\cb' . $this->bgColorIndex);
+       
+        if (empty($content)) {
+            return $content;
+        }
 
         return $content . ' ';
     }