dcda81c471 test: add coverage for script parse error in ParseScript (pierrenn)
Pull request description:
Follow up on this suggestion : https://github.com/bitcoin/bitcoin/pull/18416#issuecomment-603966799
This adds a test case to raise the `script parse error` in `ParseScript`.
ACKs for top commit:
instagibbs:
utACK dcda81c471
Tree-SHA512: ae0ef2c00f34cee818c83582f190d5f4043159e922862f2b442b7b895b8ff3ca421533699247c12c367be77813b5205830a771cd47a18e8932807ccace2d6a1c