fix: branch existence checks

Co-authored-by: blooper05 <[email protected]>

Author: ChrisJStone

git-flow-hotfix

@@ -349,17 +349,18 @@ showcommands!     Show git commands while executing them
 
 	# Sanity checks
 	require_clean_working_tree
-	require_branch_absent "$BRANCH"
-	git_do fetch -q "$ORIGIN"
-	require_branch "$ORIGIN/$BRANCH"
+	require_local_branch_absent "$BRANCH"
+
+	git_do fetch -q "$ORIGIN"  || die "Could not fetch branch '$BRANCH' from remote '$ORIGIN'."
+	git_remote_branch_exists "$ORIGIN/$BRANCH"
 
 	# Create tracking branch
-	git_do checkout -b "$BRANCH" "$ORIGIN/$BRANCH"
+	git_do checkout -b "$BRANCH" "$ORIGIN/$BRANCH" || die "Could not create branch '$BRANCH'."
 
 	echo
 	echo "Summary of actions:"
 	echo "- A new remote tracking branch '$BRANCH' was created"
-	echo "- You are now on branch '$BRANCH'"
+	echo "- You are now on branch '$(git_current_branch)'"
 	echo
 }