forms: ensure ip and mac are not empty in client add form

Use the WTForms validator InputRequired to check the field
and disable the submit button if either the IP or MAC fields
have no contents.

ogcp/forms/action_forms.py

@@ -122,8 +122,10 @@ class FolderForm(FlaskForm):
 class ClientDetailsForm(FlaskForm):
     server = HiddenField()
     name = StringField(label=_l('Name'))
-    ip = StringField(label=_l('IP'))
-    mac = StringField(label=_l('MAC'))
+    ip = StringField(label=_l('IP'),
+                     validators=[InputRequired()])
+    mac = StringField(label=_l('MAC'),
+                      validators=[InputRequired()])
     serial_number = StringField(label=_l('Serial Number'))
     livedir = SelectField(label=_l('ogLive'),
                           choices=[('ogLive', 'Default'),])

ogcp/views.py

@@ -1472,6 +1472,11 @@ def action_folder_add_post():
 def action_client_add():
     form = ClientDetailsForm(request.form)
     if request.method == 'POST':
+
+        if not form.validate():
+            flash(form.errors, category='error')
+            return redirect(url_for('servers'))
+
         payload = {"boot": form.boot.data,
                    "ip": form.ip.data,
                    "livedir": form.livedir.data,