support empty line

lualib/skynet/remotedebug.lua

@@ -65,6 +65,7 @@ local function hook_dispatch(dispatcher, resp, fd, channel)
 				if cmd == "cont" then
 					break
 				end
+				if cmd ~= "" then
 					if sleep then
 						if cmd == "c" then
 							print "continue..."
@@ -85,6 +86,7 @@ local function hook_dispatch(dispatcher, resp, fd, channel)
 					if f then
 						print(select(2,pcall(f)))
 					end
+				end
 				newline = true
 			else
 				-- no input

service/debug_console.lua

@@ -228,9 +228,7 @@ function COMMAND.debug(address, fd)
 				skynet.send(agent, "lua", "cmd", "cont")
 				break
 			end
-			if cmdline ~= "" then
 			skynet.send(agent, "lua", "cmd", cmdline)
-			end
 		until stop or cmdline == "cont"
 	end)
 	skynet.call(agent, "lua", "start", address, fd)