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server crash on query of nonexistent field relation #280

Description

@lucianmat

Sending query for a relationship that has not yet registered field, it will crash the server :

Promise.resolve()
    .then(()=>{
        var object = new Parse.Object('TestObject');
        object.set('name','Named');
        return object.save()
            .then(function (rez) {
                var query =rez.relation('users').query();
                return query.find()
                        .then((users)=>{
                            console.log(users);
                        },(err)=>{
                            console.error(err);
                        });
            });
    })

It will crash with error :

Uncaught internal server error. [TypeError: Cannot read property 'match' of undefined] TypeError: Cannot read property 'match' of undefined
    at [...]/parse-server/ExportAdapter.js:108:18
    at process._tickDomainCallback (node.js:444:9)

To fix, I think that line 108 should be :

var match = t ? t.match(/^relation<(.*)>$/) : false;

(as it is in similar function reduceInRelation )

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