Added guard against non-SSL access

objects.js

@@ -8758,6 +8758,20 @@ CamSnapshotDialogMorph.prototype.buildContents = function () {
     this.drawNew();
 };
 
+CamSnapshotDialogMorph.prototype.popUp = function (world) {
+    CamSnapshotDialogMorph.uber.popUp.call(this, world);
+
+    if (location.protocol === 'http:') {
+        this.ide.inform(
+            'SSL Error',
+            'Due to browser security policies, you need to\n' +
+            'access Snap! through HTTPS to use the camera.\n\n' +
+            'Plase replace the "http://" part of the address\n' +
+            'in your browser by "https://" and try again.');
+        this.destroy();
+    }
+};
+
 CamSnapshotDialogMorph.prototype.ok = function () {
     var stage = this.ide.stage,
         canvas = newCanvas(stage.dimensions);
@@ -8775,11 +8789,17 @@ CamSnapshotDialogMorph.prototype.ok = function () {
     );
 
     this.accept(new Costume(canvas), this.sprite.newCostumeName('camera'));
-    CamSnapshotDialogMorph.uber.destroy.call(this);
+    this.close();
 };
 
 CamSnapshotDialogMorph.prototype.destroy = function () {
-    this.videoElement.remove();
     this.oncancel.call(this);
+    this.close();
+};
+
+CamSnapshotDialogMorph.prototype.close = function () {
+    if (this.videoElement) {
+        this.videoElement.remove();
+    }
     CamSnapshotDialogMorph.uber.destroy.call(this);
 };