fix: fix error when exception has no previous exception

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 45.30%. Comparing base (c5d5a04) to head (174101a).

Files	Patch %	Lines
myparcelnl.php	77.77%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## beta #260 +/- ## ============================================ + Coverage 45.29% 45.30% +0.01% Complexity 554 554 ============================================ Files 146 146 Lines 3568 3571 +3 Branches 55 55 ============================================ + Hits 1616 1618 +2 - Misses 1897 1898 +1 Partials 55 55 ``` | [Flag](https://app.codecov.io/gh/myparcelnl/prestashop/pull/260/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=myparcelnl) | Coverage Δ | | |---|---|---| | [admin](https://app.codecov.io/gh/myparcelnl/prestashop/pull/260/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=myparcelnl) | `0.00% <ø> (ø)` | | | [backend](https://app.codecov.io/gh/myparcelnl/prestashop/pull/260/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=myparcelnl) | `74.32% <77.77%> (-0.02%)` | :arrow_down: | | [checkout](https://app.codecov.io/gh/myparcelnl/prestashop/pull/260/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=myparcelnl) | `0.00% <ø> (ø)` | | | [frontend](https://app.codecov.io/gh/myparcelnl/prestashop/pull/260/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=myparcelnl) | `0.00% <ø> (ø)` | | | [unit](https://app.codecov.io/gh/myparcelnl/prestashop/pull/260/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=myparcelnl) | `45.30% <77.77%> (+0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=myparcelnl#carryforward-flags-in-the-pull-request-comment) to find out more.

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[myparcel-bot[bot]]

PDK upgrade summary

The following packages were upgraded:

Package	Old version	New version
@myparcel-pdk/admin-component-tests	1.0.0	1.1.0
@myparcel-pdk/admin-preset-bootstrap4	1.0.0	1.1.1
@myparcel-pdk/admin-preset-default	1.0.0	1.2.0
@myparcel-pdk/admin	1.0.0	1.1.0
@myparcel-pdk/checkout	1.0.0	1.0.4

[myparcel-bot[bot]]

✅ Build successful!

You can find a link to the downloadable artifact below.

Name	Link
Commit	174101a6f40be119c46a792ceb0fc3cbbc2e58ab
Logs	https://github.com/myparcelnl/prestashop/actions/runs/9891030742
Download	https://github.com/myparcelnl/prestashop/suites/25890371187/artifacts/1690761303

[myparcel-bot[bot]]

:tada: This PR is included in version 4.0.0-beta.4 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: