Revert "CBG-2973: Fix panic for assigning to nil map inside Mutable1x…

…Body (#6252)"

This reverts commit 044bf5b.

db/revision_cache_interface.go

@@ -162,9 +162,6 @@ func (rev *DocumentRevision) Mutable1xBody(db *DatabaseCollectionWithUser, reque
 	if err != nil {
 		return nil, err
 	}
-	if b == nil {
-		return nil, base.RedactErrorf("null doc body for docID: %s revID: %s", base.UD(rev.DocID), base.UD(rev.RevID))
-	}
 
 	b[BodyId] = rev.DocID
 	b[BodyRev] = rev.RevID

rest/api_test.go

@@ -2678,19 +2678,6 @@ func TestDocChannelSetPruning(t *testing.T) {
 	assert.Equal(t, uint64(12), syncData.ChannelSetHistory[0].End)
 }
 
-func TestNullDocHandlingForMutable1xBody(t *testing.T) {
-	rt := NewRestTester(t, nil)
-	defer rt.Close()
-	collection := rt.GetSingleTestDatabaseCollectionWithUser()
-
-	documentRev := db.DocumentRevision{DocID: "doc1", BodyBytes: []byte("null")}
-
-	body, err := documentRev.Mutable1xBody(collection, nil, nil, false)
-	require.Error(t, err)
-	require.Nil(t, body)
-	assert.Contains(t, err.Error(), "null doc body for doc")
-}
-
 func TestTombstoneCompactionAPI(t *testing.T) {
 	rt := NewRestTester(t, nil)
 	rt.GetDatabase().PurgeInterval = 0