Add more command to msh for module.

components/finsh/cmd.c

@@ -516,8 +516,8 @@ int list_module(void)
 
     return 0;
 }
-
-FINSH_FUNCTION_EXPORT(list_module, list module in system)
+FINSH_FUNCTION_EXPORT(list_module, list module in system);
+MSH_CMD_EXPORT(list_module, list module in system);
 
 int list_mod_detail(const char *name)
 {
@@ -605,6 +605,8 @@ int list_mod_detail(const char *name)
             if (!rt_list_isempty(tlist)) _list_timer(tlist);
         }
 
+		if (module->nsym > 0)
+		{
 	        rt_kprintf("symbol    address   \n");
 	        rt_kprintf("-------- ----------\n");
 	    
@@ -615,10 +617,12 @@ int list_mod_detail(const char *name)
 	                       module->symtab[i].name, module->symtab[i].addr);
 	        }
 		}
+    }
 
     return 0;
 }
 FINSH_FUNCTION_EXPORT(list_mod_detail, list module objects in system)
+MSH_CMD_EXPORT(list_mod_detail, list module objects in system)
 #endif
 
 long list(void)