Fix gibjob

mine/client.lua

@@ -511,7 +511,11 @@ function enqueueForJob2()
             rednet.send(server, "gibjob")
             _, job, _ = rednet.receive()
             if message then
-                return tonumber(job)
+                if message != "nojobs" then
+                    return tonumber(job)
+                else
+                    sleep(3)
+                end
             else
                 if not retrying then
                     retrying = true

mine/server.lua

@@ -31,6 +31,9 @@ while true do
                         job = getNextJob()
                         rednet.send(receiver, tostring(job))
                         print("Found job request. Offering "..tostring(job))
+                    else
+                        rednet.send(receiver, "nojobs")
+                        print("Found job request. Rejecting...")
                     end
                 elseif message == "report" then
                     _, job, _ = rednet.receive()