2d44350b44 Revert "errors if expecing headers notification but not subscribed" (Riccardo Casatta)
Pull request description:
This reverts commit b86f2bb22c.
Some errors started to happen in downstream tests after this commit
#114
ACKs for top commit:
danielabrozzoni:
utACK 2d44350b44
Tree-SHA512: d31174055f4245cc9d99f336b166a44271067b8daecaf2bb55d507ecfa4eb557b9802d576742fba59fd4dfda3f45fc76f02d7896af31353f19fc3a38698ac5a2