Add online check to printcore send() similar to send_now()

printcore.py

@@ -198,6 +198,7 @@ class printcore():
         """Adds a command to the checksummed main command queue if printing, or sends the command immediately if not printing
         """
         
+        if(self.online):
             if(self.printing):
                 self.mainqueue+=[command]
             else:
@@ -212,6 +213,8 @@ class printcore():
                 while ((wait > 0) and not self.clear):
                     time.sleep(0.001)
                     wait-=1
+        else:
+            print "Not connected to printer."
         
     
     def send_now(self,command,wait=0):