prevent possible NPE on process instance state conversion from client => server
build javadoc only in profile "javadoc"
Merge branch '6.2.x'

Conflicts:
	bpm/bonita-api/bonita-common-api-impl/pom.xml
	bpm/bonita-api/bonita-common-api/src/main/java/org/bonitasoft/engine/api/CommandAPI.java
	bpm/bonita-api/bonita-common-api/src/main/java/org/bonitasoft/engine/api/PlatformCommandAPI.java
	bpm/bonita-util/pom.xml
Merge branch 'master' into MasterBugFixing

Conflicts:
	bpm/bonita-api/bonita-common-api/src/main/java/org/bonitasoft/engine/api/CommandAPI.java
	bpm/bonita-api/bonita-common-api/src/main/java/org/bonitasoft/engine/api/PlatformCommandAPI.java