Custom element doesn't exist should be fix

[marcokreeft87]

Checklist

• [x] Version is upped
• [x] Info.md is up to date
• [x] Unit tests coverage is 100 %

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (9d6ca65) 99.37% compared to head (71967d2) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #274 +/- ## =========================================== + Coverage 99.37% 100.00% +0.62% =========================================== Files 14 14 Lines 477 487 +10 Branches 193 194 +1 =========================================== + Hits 474 487 +13 + Misses 3 0 -3 ``` | [Files](https://app.codecov.io/gh/marcokreeft87/room-card/pull/274?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marco+Kreeft) | Coverage Δ | | |---|---|---| | [src/index.ts](https://app.codecov.io/gh/marcokreeft87/room-card/pull/274?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marco+Kreeft#diff-c3JjL2luZGV4LnRz) | `100.00% <100.00%> (+4.41%)` | :arrow_up: |

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[github-actions[bot]]

:open_umbrella: Code Coverage

% Stmts	% Branch	% Funcs	% Lines
100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:

Click to expand

File	% Stmts	% Branch	% Funcs	% Lines
src
index.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
entity.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
util.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
template.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
hide.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
src/lib
seconds_to_duration.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
format_number.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
constants.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
compute_state_display.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
format_date.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
format_date_time.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
use_am_pm.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
format_time.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle:
src/types
room-card-types.ts	100 :green_circle:	100 :green_circle:	100 :green_circle:	100 :green_circle: