Dont set empty strings

storage/driver/boltdb.go

@@ -296,7 +296,7 @@ func applyUnset(doc, operator bson.M) (bson.M, error) {
 				return nil, err
 			}
 			operator[k] = subdoc
-		} else {
+		} else if len(k) > 0 {
 			delete(doc, k)
 		}
 	}
@@ -329,7 +329,7 @@ func applySet(doc, operator bson.M) (bson.M, error) {
 				return nil, err
 			}
 			doc[nesting[0]] = subdoc
-		} else {
+		} else if len(k) > 0 {
 			doc[k] = v
 		}
 	}

storage/operator/modify.go

@@ -77,8 +77,6 @@ func opMarshalable(op, key string, value interface{}) map[string]interface{} {
 		m["$set"].(map[string]interface{})[entity.Modified] = time.Now().UnixNano()
 	case bson.M:
 		m["$set"].(bson.M)[entity.Modified] = time.Now().UnixNano()
-		//case primitive.M:
-		//m["$set"].(primitive.M)[entity.Modified] = time.Now().UnixNano()
 	}
 	return m
 }