fix section changes HTML generation from makefile

.github/workflows/zenodo.yml

@@ -28,6 +28,7 @@ jobs:
     - name: Generate Changelog
       id: zenodo_metadata
       run: |
+        cd 
         make generate-changes-html VERSION=${{ github.ref_name }}
         echo "ZENODO_DESCRIPTION=$(cat reports/CHANGES_${{ github.ref_name }}.html | tr -d '\n')" >> $GITHUB_ENV
 

Makefile

@@ -759,10 +759,10 @@ extract-changes:	## uses the specified VERSION to extract its sub-section in CHA
 	@-echo "Extracting changes for ${VERSION} ..."
 	@bash -c '\
 		START=$$(cat "$(APP_ROOT)/CHANGES.rst" | grep -n "crim-ca/weaver/tree/${VERSION}" | cut -d ":" -f 1); \
-		STOP=$$(tail -n +$$(($${START} + 2)) "$(APP_ROOT)/CHANGES.rst" \
+		STOP=$$(tail -n +$$(($${START:-0} + 2)) "$(APP_ROOT)/CHANGES.rst" \
 			| grep -n ".. _changes" \
 			| cut -d ":" -f 1 | head -n 1); \
-		tail -n +$${START} "$(APP_ROOT)/CHANGES.rst" | head -n $${STOP} \
+		tail -n +$${START:-0} "$(APP_ROOT)/CHANGES.rst" | head -n $${STOP:--1} \
 			> "$(REPORTS_DIR)/CHANGES_${VERSION}.rst" \
 	'