Adding error condition to billing check (#4272)
Adding error condition to billing check (#4272)

Co-authored-by: Bu Sun Kim <e20aa14702d7e04a52a901b5515eeecef97a5b5f@users.noreply.github.com>
Co-authored-by: Ace Nassri <66a75941ededf131c26806c52c2b5e1fb48aad03@google.com>
Co-authored-by: Christopher Wilcox <1a61e7a0041d068722f1c352424109b22f854ce0@google.com>
GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples