fix(manager): don't show overwhelming form JSON validation errors

Author: davidlougheed

src/hooks.ts

@@ -116,8 +116,12 @@ export const useJsonSchemaValidator = (schema: SchemaObject, schemaName: string,
       if (validator(value)) {
         return Promise.resolve();
       } else {
-        console.error(`schema validation errors (schema=${schemaName})`, validator.errors);
-        return Promise.reject(new Error(ajv.errorsText(validator.errors)));
+        console.error(`schema validation errors (schema=${schemaName})`, validator?.errors);
+        const err = `JSON failed ${schemaName} schema validation`;
+        if (validator.errors?.length === 1) {
+          return Promise.reject(new Error(`${err}: ${ajv.errorsText(validator.errors)}`));
+        }
+        return Promise.reject(new Error(`${err} (see console for details)`));
       }
     },
     [acceptFalsyValue, ajv, schemaName],