Accessing properties/indexes of unknown object in JavaScript

gistfile1.txt

function NewPollCtrl($scope, $http, $location, $q) {
  $scope.poll = {
    options: [{
      text: ''
    }, {
      text: ''
    }]
  };

  $scope.cbstate = "not-pressed";

  inputTyped = function() {
    $scope.cbstate = "pressed";
  }

  $scope.smartText = function(input1Text, input2Text) {
    var p1, p2;
    input1Text === "" ? p1 = "____ " : p1 = input1Text.replace(/\b\w/g, function(l) {
      return l.toUpperCase()
    }) + " ";
    input2Text === "" ? p2 = "..." : p2 = " " + input2Text.replace(/\b\w/g, function(l) {
      return l.toUpperCase()
    });
    return p1 + "and" + p2;
  }

  $scope.addChoice = function() {

    if ($scope.poll.options.length > 3) {
      //$scope.error;
      console.log("Too many choices");
    } else {
      $scope.poll.options.push({
        text: ''
      });
    }
  };

  $scope.getRequest = function() {
    $http.post('/api/pollPost', JSON.stringify($scope.poll)).then(
      function successCallback(response) {
        console.log(response.data);
        $location.path('/getPoll/' + JSON.stringify(response.data));
        //console.log(response);
      },
      function failedCallback(response) {

      }
    );
  };

  $scope.addProperties = function() {
    for (var i = 0; i < $scope.poll.options.length; i++) {
      $scope.poll.options[i].votes = 0;
      $scope.poll.options[i].imageURL = "";
    }
  };

  $scope.textBoxValidation = function(poll) {
    var isValid = true;

    for (var i = 0; i < poll.options.length; i++) {
      if (poll.options[i].text.length == 0) {
        isValid = false;
        console.log("Error blank answers");
        break;
      }
    }
    return isValid
  };

  $scope.submitChoice = function() {
    var poll = $scope.poll;

    var isValid = $scope.textBoxValidation(poll);

    if (isValid) {
      var defer = $q.defer();

      defer.promise
        .then(function() {
          $scope.addVotesProperty();
        }).then(function() {
          console.log('test');
        }).then(function() {
          $scope.getRequest();
        });

      defer.resolve();
    } else {
      console.log('Your poll is invalid');
    }
  };

  $scope.submitChoice = function() {
    var poll = $scope.poll;

    var isValid = $scope.textBoxValidation(poll);

    if (isValid) {
      var defer = $q.defer();

      defer.promise
        .then(function() {
          $scope.addProperties();
        }).then(function() {
          $scope.getPictures().then(function(result) {
            console.log(result);
            console.log("RESULT: " + result.length);
            console.log("$SCOPE: " + $scope.poll.options.length);
            for(var i = 0; i < $scope.poll.options.length; i++) {
              console.log(result[i]);
              $scope.poll.options[i].imageURL = result[i];
            }
            console.log($scope.poll);
          });
        });

      defer.resolve();
    } else {
      console.log('Your poll is invalid');
    }
  };

  $scope.getPictures = function() {
    var q = $q.defer();
    var promises = [];

    angular.forEach($scope.poll.options, function(value) {
      $scope.bingRequest(value.text).then(function(result) {
        promises.push(result.value[0].contentUrl);
      })
    })

    q.resolve(promises);
    return q.promise;
  };

  $scope.bingRequest = function(searchTerm) {
    var q = $q.defer();
    console.log(searchTerm);
    $http.get('https://api.cognitive.microsoft.com/bing/v5.0/images/search?q=' + searchTerm + '&count=1&offset=0&mkt=en-us&safeSearch=Strict', {
      headers: {
        'Ocp-Apim-Subscription-Key': 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
      }
    }).success(function(response) {
      q.resolve(response);
    }).error(function(err, status) {
      q.reject(err);
    });
    return q.promise;
  };
}