Merge pull request #23886 from gnossen/distribtest_breakage

Fix parallelism when env variable unset

tools/distrib/python/grpcio_tools/_parallel_compile_patch.py

@@ -22,7 +22,7 @@ import os
 
 try:
     BUILD_EXT_COMPILER_JOBS = int(
-        os.environ.get('GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS'))
+        os.environ['GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS'])
 except KeyError:
     import multiprocessing
     BUILD_EXT_COMPILER_JOBS = multiprocessing.cpu_count()