Fix issue with NPE when no recipient providers
Ready for new fix release
[maven-release-plugin] prepare release email-ext-2.38.1
Merge tag 'email-ext-2.38.1'

[maven-release-plugin]  copy for tag email-ext-2.38.1

Conflicts:
	pom.xml
	src/main/java/hudson/plugins/emailext/EmailType.java
Fix JENKINS-23660
Merge branch 'master' of github.com:jenkinsci/email-ext-plugin