Add warning if using default password

rootfs/standard/var/www/mynode/device_info.py

@@ -134,4 +134,7 @@ def get_device_changelog():
         changelog = subprocess.check_output(["cat", "/usr/share/mynode/changelog"])
     except:
         changelog = "ERROR"
-    return changelog
+    return changelog
+
+def has_changed_password():
+    return os.path.isfile("/home/bitcoin/.mynode/.hashedpw")

rootfs/standard/var/www/mynode/mynode.py

@@ -375,6 +375,7 @@ def index():
             "ram_usage": get_ram_usage(),
             "swap_usage": get_swap_usage(),
             "device_temp": get_device_temp(),
+            "has_changed_password": has_changed_password(),
             "upgrade_available": upgrade_available
         }
         return render_template('main.html', **templateData)

rootfs/standard/var/www/mynode/templates/main.html

@@ -140,6 +140,12 @@
 
         {% include 'includes/message_display.html' %}
 
+        {% if not has_changed_password %}
+        <div class="upgrade_ad_main_page">
+            <p style="text-align: center;"><b>Warning!</b><br/>You appear to be using the default password! You should change it to something else on the <a href="/settings">settings</a> page.</p>
+        </div>
+        {% endif %}
+
         <div class="app_tile_row">
             <div>
                 <div class="main_header">Core Services</div>