Crashes when templates/NOTES.txt exists

[jglick]

No idea what this error message might mean (not mentioned explicitly in this repo’s sources), and there is not enough detail to track down the problem.

$ helm fetch --repo https://charts.cloudbees.com/public/cloudbees --version 1.253+657471732ccb cloudbees-sda
$ helm install somestuff cloudbees-sda-1.253+657471732ccb.tgz
…
NAME: somestuff
LAST DEPLOYED: Mon Mar  1 08:55:56 2021
…
$ …/bacongobbler/helm-patchdiff/helm-patchdiff somestuff cloudbees-sda-1.253+657471732ccb.tgz
2021/03/01 08:56:17 YAML parse error on cloudbees-sda/charts/cd/charts/mariadb/templates/NOTES.txt: error converting YAML to JSON: yaml: line 3: mapping values are not allowed in this context

[jglick]

Even on the tiny sample from databus23/helm-diff#263 helm-patchdiff fails with a cryptic error (which goes away if you delete NOTES.txt):

2021/03/02 07:45:09 YAML parse error on diffdemo/templates/NOTES.txt: error unmarshaling JSON: while decoding JSON: json: cannot unmarshal string into Go value of type releaseutil.SimpleHead