minor code changes

Author: arul-trenser

platform/app/src/components/ViewportGrid.tsx

@@ -178,7 +178,7 @@ function ViewerViewportGrid(props: withAppTypes) {
         const { displaySetInstanceUID: referencedDisplaySetInstanceUID } = measurement;
 
         const updatedViewports = _getUpdatedViewports(viewportId, referencedDisplaySetInstanceUID);
-        let viewportToUpdate = updatedViewports[0];
+        let viewportToUpdate;
         if (updatedViewports.length > 1) {
           // To get the viewport which orientation is closest to IOP
           const closestOrientation = getClosestOrientationFromIOP(
@@ -189,7 +189,8 @@ function ViewerViewportGrid(props: withAppTypes) {
             viewport => viewport.viewportOptions?.orientation == closestOrientation
           );
         }
-
+        // If closest orientation viewport is not find then choose 0
+        viewportToUpdate = updatedViewports[0];
         if (!viewportToUpdate) {
           console.warn(
             'ViewportGrid::Unable to navigate to viewport containing',

platform/app/src/utils/getClosestOrientationFromIOP.ts

@@ -5,17 +5,19 @@ import OrientationAxis = Enums.OrientationAxis;
 /**
  * Get the plane (orientation) to which the ImageOrientationPatient is most closely aligned
  *
- * @param {Array} imageOrientationPatient - ImageOrientationPatient vector for the image
- * @returns
+ * @param displaySetService
+ * @param displaySetInstanceUID
+ * @returns orientation
  */
 export default function getClosestOrientationFromIOP(
   displaySetService,
   displaySetInstanceUID
 ): OrientationAxis {
   const displaySet = displaySetService.getDisplaySetByUID(displaySetInstanceUID);
   const imageOrientationPatient = displaySet.instances[0].ImageOrientationPatient as Array<number>;
+  // ImageOrientationPatient must be an array of length 6.
   if (imageOrientationPatient?.length !== 6) {
-    throw new Error('ImageOrientationPatient must be an array of length 6.');
+    return;
   }
 
   // Take cross product to get vector coming "out" of image plane