Error in FeedsXSLTChainLogProxy [#3581632]

Problem/Motivation

I get the error Error: Typed property Drupal\feeds_xsltparser\FeedsXSLTChainLogProxy::$originalError must not be accessed before initialization in Drupal\feeds_xsltparser\FeedsXSLTChainLogProxy->log() (line 56 of feeds_xsltparser/src/FeedsXSLTChainLogProxy.php).

Steps to reproduce

Proposed resolution

Initialize the nullable properties with NULL.

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork feeds_xsltparser-3581632

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3581632-error-in-feedsxsltchainlogproxy changes, plain diff MR !7
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