1061035 fix bulkmail throw error

language/_____LANGUAGE_EXTRA/_____LANGUAGE_EXTRA.aod

@@ -7269,6 +7269,9 @@
     <entry>
       <key>Favoritegroup</key>
     </entry>
+    <entry>
+      <key>Mailbridge failed: user '%0' is unknown, contact an administrator.</key>
+    </entry>
   </keyValueMap>
   <font name="Dialog" style="0" size="11" />
   <sqlModels>

language/_____LANGUAGE_de/_____LANGUAGE_de.aod

@@ -9642,6 +9642,10 @@ Bitte Datumseingabe prüfen</value>
     <entry>
       <key>FavoriteGroup</key>
     </entry>
+    <entry>
+      <key>Mailbridge failed: user '%0' is unknown, contact an administrator.</key>
+      <value>Mailbridge fehlgeschlagen: Benutzer '%0' ist unbekannt, kontaktieren sie einen Administrator.</value>
+    </entry>
   </keyValueMap>
   <font name="Dialog" style="0" size="11" />
 </language>

language/_____LANGUAGE_en/_____LANGUAGE_en.aod

@@ -7350,6 +7350,9 @@
     <entry>
       <key>Favoritegroup</key>
     </entry>
+    <entry>
+      <key>Mailbridge failed: user '%0' is unknown, contact an administrator.</key>
+    </entry>
   </keyValueMap>
   <font name="Dialog" style="0" size="11" />
 </language>

process/Email_lib/process.js

+import("system.question");
 import("Sql_lib");
 import("MimeType_lib");
 import("Document_lib");
@@ -10,7 +11,8 @@ import("Communication_lib");
 import("DocumentTemplate_lib");
 import("system.neon");
 import("system.mail");
-import("Bulkmail_lib")
+import("Bulkmail_lib");
+import("system.tools");
 
 function EmailWritingUtils () {}
 
@@ -380,8 +382,19 @@ Email.prototype.send = function (pUser)
         
         if (this.sender)
             mail.setSender(mailId, this.sender);
-    
-        var sentMails = mail.sendMailAs(pUser || "mailbridge", mailId)
+        var mailbridgeTitle = "mailbridge";
+        var sentMails;
+        if(pUser)
+            sentMails = mail.sendMailAs(pUser, mailId)
+        else
+        {
+            let mailbridgeExists = tools.getUser(mailbridgeTitle);
+            
+            if(mailbridgeExists)
+                mail.sendMailAs(mailbridgeTitle, mailId)
+            else //check mailbridge user if this error gets thrown
+                question.showMessage(translate.withArguments("Mailbridge failed: user '%0' is unknown, contact an administrator.", [mailbridgeTitle]), question.ERROR, translate.text("Error"));
+        }
         // remove from cache
         mail.deleteMail(mailId)
         return sentMails > 0;