SAK-43044 Messages can be sent, can't be read, with single space in subject (#8829)
(cherry picked from commit 868759b7f6a7b0e92c3e9dd12bfaa2418ac3916d)
Conflicts:
msgcntr/messageforums-app/src/java/org/sakaiproject/tool/messageforums/PrivateMessagesTool.java