fix: missing required files should count as an error

Author: testower

src/main/java/org/entur/gbfs/validation/validator/FileValidator.java

@@ -110,6 +110,9 @@ public void validateMissingFile(FileValidationResult fvr) {
             fvr.setVersion(version.getVersionString());
             fvr.setSchema(version.getSchema(fvr.getFile()).toString());
             fvr.setRequired(version.isFileRequired(fvr.getFile()));
+            if (version.isFileRequired(fvr.getFile())) {
+                fvr.setErrorsCount(1);
+            }
         }
     }
 }

src/test/java/org/entur/gbfs/validation/validator/GbfsJsonValidatorTest.java

@@ -214,6 +214,8 @@ void testMissingRequiredFile() {
 
         Assertions.assertTrue(result.getFiles().get("system_information").isRequired());
         Assertions.assertFalse(result.getFiles().get("system_information").isExists());
+
+        Assertions.assertEquals(1, result.getSummary().getErrorsCount());
     }
 
     @Test