Fixed the broken tests caused by Brian's panic fix

go/libraries/doltcore/doltdb/doltdb.go

@@ -45,7 +45,7 @@ type DoltDB struct {
 
 // LoadDoltDB will acquire a reference to the underlying noms db.  If the Location is InMemDoltDB then a reference
 // to a newly created in memory database will be used. If the location is LocalDirDoltDB, the directory must exist or
-// this function panics.
+// this returns nil.
 func LoadDoltDB(loc Location) *DoltDB {
 	if loc == LocalDirDoltDB {
 		exists, isDir := filesys.LocalFS.Exists(DoltDataDir)

go/libraries/doltcore/doltdb/doltdb_test.go

@@ -65,9 +65,7 @@ func TestLoadNonExistentLocalFSRepo(t *testing.T) {
 		panic("Couldn't change the working directory to the test directory.")
 	}
 
-	assert.Panics(t, func() {
-		LoadDoltDB(LocalDirDoltDB)
-	}, "Should have panicked when loading a non-existent data dir")
+	assert.Nil(t, LoadDoltDB(LocalDirDoltDB), "Should return nil when loading a non-existent data dir")
 }
 
 func TestLoadBadLocalFSRepo(t *testing.T) {
@@ -80,9 +78,7 @@ func TestLoadBadLocalFSRepo(t *testing.T) {
 	contents := []byte("not a directory")
 	ioutil.WriteFile(filepath.Join(testDir, DoltDataDir), contents, 0644)
 
-	assert.Panics(t, func() {
-		LoadDoltDB(LocalDirDoltDB)
-	}, "Should have panicked when loading a non-directory data dir file")
+	assert.Nil(t, LoadDoltDB(LocalDirDoltDB), "Should return nil when loading a non-directory data dir file")
 }
 
 func TestLDNoms(t *testing.T) {