GitLab 7.0: commit comment emails fail due to DelayedMailer ActionView::Template::Error undefined method `blob_at' for nil:NilClass

This issue was copied from https://github.com/gitlabhq/gitlabhq/issues/7282 -- I will remove that issue.

GitLab version: GitLab 7.0.0 de9bf7da

Output from application check:

$ bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true
Instance method "lock!" is already defined in ActiveRecord::Base, use generic helper instead or set StateMachine::Machine.ignore_method_conflicts = true.
Checking Environment ...

Git configured for git user? ... no
  Try fixing it:
  sudo -u git -H git config --global user.name  "GitLab"
  sudo -u git -H git config --global user.email "example@example.com"
  For more information see:
  doc/install/installation.md in section "GitLab"
  Please fix the error above and rerun the checks.

Checking Environment ... Finished

Checking GitLab Shell ...

GitLab Shell version >= 1.9.6 ? ... OK (1.9.6)
Repo base directory exists? ... yes
Repo base directory is a symlink? ... no
Repo base owned by git:git? ... yes
Repo base access is drwxrws---? ... yes
Satellites access is drwxr-x---? ... yes
update hook up-to-date? ... yes
update hooks in repos are links: ... 
...
OSN / sandbox ... ok
...
Running /scratch/git/gitlab-shell/bin/check
Check GitLab API access: OK
Check directories and files: 
	/scratch/git/repositories: OK
	/scratch/git/.ssh/authorized_keys: OK
Test redis-cli executable: redis-cli 2.4.10
Send ping to redis server: PONG
gitlab-shell self-check successful

Checking GitLab Shell ... Finished

Checking Sidekiq ...

Running? ... yes
Number of Sidekiq processes ... 1

Checking Sidekiq ... Finished

Checking LDAP ...

LDAP users with access to your GitLab server (only showing the first 100 results)
...

Checking LDAP ... Finished

Checking GitLab ...

Database config exists? ... yes
Database is SQLite ... no
All migrations up? ... yes
Database contains orphaned UsersGroups? ... no
GitLab config exists? ... yes
GitLab config outdated? ... no
Log directory writable? ... yes
Tmp directory writable? ... yes
Init script exists? ... yes
Init script up-to-date? ... yes
projects have namespace: ... 
...
OSN / sandbox ... yes
...
Redis version >= 2.0.0? ... yes
Your git bin path is "/opt/git/latest/bin/git"
Git version >= 1.7.10 ? ... yes (1.8.5)

Checking GitLab ... Finished

Output from gitlab:env:issue:

$ bundle exec rake gitlab:env:info RAILS_ENV=production
Instance method "lock!" is already defined in ActiveRecord::Base, use generic helper instead or set StateMachine::Machine.ignore_method_conflicts = true.

System information
System:		OracleServer 6.4
Current User:	git
Using RVM:	no
Ruby Version:	2.1.2p95
Gem Version:	2.2.2
Bundler Version:1.6.3
Rake Version:	10.3.2
Sidekiq Version:2.17.0

GitLab information
Version:	7.0.0
Revision:	de9bf7d
Directory:	/scratch/git/gitlab
DB Adapter:	mysql2
URL:		https://...
HTTP Clone URL:	https://.../some-project.git
SSH Clone URL:	git@...:some-project.git
Using LDAP:	yes
Using Omniauth:	no

GitLab Shell
Version:	1.9.6
Repositories:	/scratch/git/repositories/
Hooks:		/scratch/git/gitlab-shell/hooks/
Git:		/opt/git/latest/bin/git

Status changed to closed

Could no longer repro with GitLab 7.1; hence closed

GitLab 7.0: commit comment emails fail due to DelayedMailer ActionView::Template::Error undefined method `blob_at' for nil:NilClass

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GitLab 7.0: commit comment emails fail due to DelayedMailer ActionView::Template::Error undefined method `blob_at' for nil:NilClass

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