Don't complain about greetings with no sound

apps/openmw/mwdialogue/dialoguemanagerimp.cpp

@@ -586,7 +586,8 @@ namespace MWDialogue
             MWBase::WindowManager *winMgr = MWBase::Environment::get().getWindowManager();
             if(winMgr->getSubtitlesEnabled())
                 winMgr->messageBox(info->mResponse);
-            sndMgr->say(actor, info->mSound);
+            if (!info->mSound.empty())
+                sndMgr->say(actor, info->mSound);
         }
     }
 

components/esm/loadinfo.hpp

@@ -70,7 +70,7 @@ struct DialInfo
     // Sound and text associated with this item
     std::string mSound, mResponse;
 
-    // Result script (uncomiled) to run whenever this dialog item is
+    // Result script (uncompiled) to run whenever this dialog item is
     // selected
     std::string mResultScript;