Better error handling in generate_docs.py (#1834)

* Better error handling in generate_docs.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update generate_docs.py

* Update CHANGELOG.md

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -29,6 +29,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [Significant Changes] Improving memory management part 1/3
 - Removed strict version pins on `lmdbm`, `mpire`, `orjson`, and `pennylane`
 - Changed license to Apache
+- Improved error handling in generate_docs.py
 
 ### Added
 

doc/generate_docs.py

@@ -60,6 +60,9 @@ def run(clean_dir: bool = False) -> None:
     else:
         install_autoclass_doc_dependencies()
         cmd = subprocess.Popen(["make", "html"])
-    cmd.communicate()
+    _, stderr = cmd.communicate()
+
+    if cmd.returncode != 0:
+        print(f"Error running 'make': {stderr}")
 
     os.chdir(pwd)