Tests fixes

Author: kiturutin

browserup-proxy-rest/src/main/java/com/browserup/bup/rest/validation/NotBlankConstraint.java

@@ -38,12 +38,12 @@ public boolean isValid(Object value, ConstraintValidatorContext context) {
         return true;
       }
 
-      String escapedValue = MessageSanitizer.escape(value.toString());
+      String escapedValue = MessageSanitizer.escape(value == null ? null : value.toString());
       String errorMessage = String.format("Expected not empty value, got '%s'", escapedValue);
       LOG.warn(errorMessage);
 
       context.buildConstraintViolationWithTemplate(errorMessage).addConstraintViolation();
       return false;
     }
   }
-}
+}

browserup-proxy-rest/src/main/java/com/browserup/bup/rest/validation/PortWithExistingProxyConstraint.java

@@ -49,11 +49,11 @@ public boolean isValid(Integer value, ConstraintValidatorContext context) {
       }
 
       String escapedValue = MessageSanitizer.escape(value.toString());
-      String errorMessage = String.format("No proxy server found for specified port %d", escapedValue);
+      String errorMessage = String.format("No proxy server found for specified port %s", escapedValue);
       LOG.warn(errorMessage);
 
       context.buildConstraintViolationWithTemplate(errorMessage).addPropertyNode(PARAM_NAME).addConstraintViolation();
       return false;
     }
   }
-}
+}