Fix adding props when feature was autopopulated

Author: hackermd

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "dicom-microscopy-viewer",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "description": "Interactive web-based viewer for DICOM Microscopy Images",
   "main": "build/dicom-microscopy-viewer.js",
   "scripts": {

package.json

@@ -1118,7 +1118,11 @@ class VolumeImageViewer {
       const id = feature.getId();
       if (id === uid) {
         const properties = feature.getProperties();
-        properties['measurements'].push(item);
+        if (!('measurements' in properties)) {
+          properties['measurements'] = [item]
+        } else {
+          properties['measurements'].push(item);
+        }
         feature.setProperties(properties, true);
       }
     })
@@ -1136,7 +1140,11 @@ class VolumeImageViewer {
       const id = feature.getId();
       if (id === uid) {
         const properties = feature.getProperties();
-        properties['evaluations'].push(item);
+        if (!('evaluations' in properties)) {
+          properties['evaluations'] = [item]
+        } else {
+          properties['evaluations'].push(item);
+        }
         feature.setProperties(properties, true);
       }
     })