Fixing user reported problem (#13)

Scriptgen UI initial launch required configuration messages are not
sufficient to guild the user.
tektronix/tsp-toolkit#147

Author: jharajeev55

script-gen-ui/src/app/components/empty-config/empty-config.component.html

@@ -1,4 +1,11 @@
 <p>
-  System configuration is empty. Please configure Trebuchet mainframe as
-  localnode or one of the nodes to enable script generation.
+  Script generation requires channels from a selected system configuration.
+  <br><br>
+  Please select a system configuration that includes:
+  <br>
+  • An MP5103 mainframe
+  <br>
+  • Either MPSU50-2ST or MSMU60-2 modules installed in slots
+  <br>
+  • Located in the localnode or one of the TSP-Link nodes
 </p>