fix: isObjectField(s) empty field

src/database/mongo/hash.js

@@ -156,7 +156,9 @@ module.exports = function (module) {
 		const data = {};
 		fields.forEach((field) => {
 			field = helpers.fieldToString(field);
+			if (field) {
 				data[field] = 1;
+			}
 		});
 
 		const item = await module.client.collection('objects').findOne({ _key: key }, { projection: data });

test/database/hash.js

@@ -406,6 +406,11 @@ describe('Hash methods', () => {
 				done();
 			});
 		});
+
+		it('should not error if field is falsy', async () => {
+			const value = await db.isObjectField('hashTestObjectEmpty', '');
+			assert.strictEqual(value, false);
+		});
 	});
 
 
@@ -427,6 +432,11 @@ describe('Hash methods', () => {
 				done();
 			});
 		});
+
+		it('should not error if one field is falsy', async () => {
+			const values = await db.isObjectFields('hashTestObject', ['name', '']);
+			assert.deepStrictEqual(values, [true, false]);
+		});
 	});
 
 	describe('deleteObjectField()', () => {