Fix error when spell-checking an empty text (#1489831)

CHANGELOG

@@ -25,6 +25,7 @@ CHANGELOG Roundcube Webmail
 - Fix redundant alert message on over-size uploads (#1489817)
 - Fix next message display after removing a message (#1489800)
 - Fix missing Mail-Followup-To header in sent mail (#1489829)
+- Fix error when spell-checking an empty text (#1489831)
 
 RELEASE 1.0.0
 -------------

program/js/googiespell.js

@@ -289,6 +289,7 @@ this.prepare = function(ignore, no_indicator)
     this.cnt_errors_fixed = 0;
     this.cnt_errors = 0;
     this.setStateChanged('checking_spell');
+    this.orginal_text = '';
 
     if (!no_indicator && this.main_controller)
         this.appendIndicator(this.spell_span);

program/lib/Roundcube/rcube_spellcheck_googie.php

@@ -56,6 +56,10 @@ class rcube_spellcheck_googie extends rcube_spellcheck_engine
     {
         $this->content = $text;
 
+        if (empty($text)) {
+            return $this->matches = array();
+        }
+
         // spell check uri is configured
         $url = rcube::get_instance()->config->get('spellcheck_uri');
 

program/steps/utils/spell.inc

@@ -37,6 +37,9 @@ if ($learn_word) {
     $spellchecker->add_word($data);
     $result = '<?xml version="1.0" encoding="'.RCUBE_CHARSET.'"?><learnwordresult></learnwordresult>';
 }
+else if (empty($data)) {
+    $result = '<?xml version="1.0" encoding="'.RCUBE_CHARSET.'"?><spellresult charschecked="0"></spellresult>';
+}
 else {
     $spellchecker->check($data);
     $result = $spellchecker->get_xml();

program/steps/utils/spell_html.inc

@@ -35,7 +35,7 @@ $result['id'] = $request['id'];
 $spellchecker = new rcube_spellchecker($lang);
 
 if ($request['method'] == 'checkWords') {
-    $result['result'] = $spellchecker->get_words($data);
+    $result['result'] = empty($data) ? array() : $spellchecker->get_words($data);
 }
 else if ($request['method'] == 'getSuggestions') {
     $result['result'] = $spellchecker->get_suggestions($data);