Refactoring set temp to work with the prontserve logError exceptions

pronsole.py

@@ -1082,11 +1082,15 @@ class pronsole(cmd.Cmd):
         self.log(_("Read the extruder and bed temperature."))
 
     def do_settemp(self, l):
-        try:
         l = l.lower().replace(", ",".")
         for i in self.temps.keys():
             l = l.replace(i, self.temps[i])
+        try:
            f = float(l)
+        except:
+            self.logError(_("You must enter a temperature."))
+            return
+
         if f>=0:
             if f > 250:
                print _("%s is a high temperature to set your extruder to. Are you sure you want to do that?") % f
@@ -1099,8 +1103,6 @@ class pronsole(cmd.Cmd):
                 self.logError(_("Printer is not online."))
         else:
             self.logError(_("You cannot set negative temperatures. To turn the hotend off entirely, set its temperature to 0."))
-        except:
-            self.logError(_("You must enter a temperature."))
 
     def help_settemp(self):
         self.log(_("Sets the hotend temperature to the value entered."))