v0.7.2.4 blank card

[D34DC3N73R]

Describe the bug
The card appears blank upon creation (no title /content) even after choosing toggles. This is for both the card editor and after it's saved.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Edit Dashboard'
2. Click on 'Add Card'
3. Scroll down and click 'Custom: mailandpackages Card'
4. Configure name & desired entities
5. Visual representation of the card remains empty.
6. Save - card remains blank

Expected behavior
The entities and title appear on the visual representation of the card in the editor as well as the card itself after being saved.

Screenshots or Error

Hass environment (please complete the following information):

version	core-2021.3.4
installation_type	Home Assistant Container
dev	false
hassio	false
docker	true
virtualenv	false
python_version	3.8.7
os_name	Linux
os_version	5.4.0-70-generic
arch	x86_64

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Chrome
• Version: 89.0.4389.90

Smartphone (please complete the following information):
N/A

Additional context
code editor view of blank card

type: 'custom:mailandpackages-card'
name: Mail and Packages
entity_packages_delivered: true
entity_packages_in_transit: true
entity_fedex_packages: true
entity_UPS_packages: true
entity_USPS_packages: true
entity_USPS_exceptions: true
entity_usps_mail: true
show_usps_camera: true
entity_amazon_packages: true
entity_amazon_packages_delivered: true
entity_amazon_hub_packages: true
show_amazon_camera: true
show_warning: true
show_error: true

[drguitarum2005]

This was resolved for me when I toggled 'warning' and 'error' to off/false