fix: Update fetchPaletteColorLookupTableData: LUT Entries shall be 0 if the table entries value is 2^16 (#2395)

Opened issue https://github.com/OHIF/Viewers/issues/2366. 

Following http://dicom.nema.org/medical/Dicom/2018d/output/chtml/part03/sect_C.7.6.3.html#sect_C.7.6.3.1.5, LUT Entries shall be 0 if the table entries value is 2^16.

If numLutEntries is 0, there is no for loop and return empty lut array.

Solution:

const numLutEntries = lutDescriptor[0] ? lutDescriptor[0] : 65536;

This is often used by Philips Ultrasound equipments.

Co-authored-by: Alireza <ar.sedghi@gmail.com>
Co-authored-by: Erik Ziegler <erik.sweed@gmail.com>

platform/core/src/utils/metadataProvider/fetchPaletteColorLookupTableData.js

@@ -113,7 +113,7 @@ const _paletteColorCache = {
 };
 
 function _getPaletteColor(server, paletteColorLookupTableData, lutDescriptor) {
-  const numLutEntries = lutDescriptor[0];
+  const numLutEntries = lutDescriptor[0] ? lutDescriptor[0] : 65536;
   const bits = lutDescriptor[2];
 
   const arrayBufferToPaletteColorLUT = arraybuffer => {