Versions are obligatory for challanges and submission

DB-SCEHEME-BREAKING CHANGE

Handler/CreateChallenge.hs

@@ -146,7 +146,7 @@ addChallenge name publicRepoId privateRepoId chan = do
     challengeImage=mImage,
     challengeStarred=False,
     challengeArchived=Just False,
-    challengeVersion=Just commit}
+    challengeVersion=commit}
 
   updateTests challengeId chan
 

config/models

@@ -40,7 +40,7 @@ Challenge
     image ByteString Maybe
     starred Bool
     archived Bool Maybe
-    version SHA1 Maybe
+    version SHA1
 -- challenge version
 Version
     commit SHA1
@@ -70,7 +70,7 @@ Submission
     isPublic Bool default=False
     isHidden Bool default=False
     -- challenge version present when the submission was done
-    version SHA1 Maybe
+    version SHA1
     UniqueSubmissionRepoCommitChallenge repo commit challenge
 Variant
     submission SubmissionId