Added filtering blank lines from history

examples/system/console/main/console_example_main.c

@@ -173,12 +173,14 @@ void app_main(void)
         if (line == NULL) { /* Break on EOF or error */
             break;
         }
-        /* Add the command to the history */
+        /* Add the command to the history if not empty*/
+        if(strlen(line) > 0) {
             linenoiseHistoryAdd(line);
 #if CONFIG_STORE_HISTORY
             /* Save command history to filesystem */
             linenoiseHistorySave(HISTORY_PATH);
 #endif
+        }
 
         /* Try to run the command */
         int ret;