fix Index 1 out of bounds length 0 on createLut(Attributes)

[cicciu]

For some particular images I had the following error:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 0
    at org.dcm4che3.util.ByteUtils.bytesToShortsLE(ByteUtils.java:92)
    at org.dcm4che3.util.ByteUtils.bytesToShorts(ByteUtils.java:86)
    at org.dcm4che3.img.DicomImageUtils.createLut(DicomImageUtils.java:171)
    at org.dcm4che3.img.lut.VoiLutModule.lambda$init$1(VoiLutModule.java:88)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
    at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
    at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
    at org.dcm4che3.img.lut.VoiLutModule.init(VoiLutModule.java:89)
    at org.dcm4che3.img.lut.VoiLutModule.<init>(VoiLutModule.java:55)
    at org.dcm4che3.img.stream.ImageDescriptor.<init>(ImageDescriptor.java:82)
    at org.dcm4che3.img.stream.ImageDescriptor.<init>(ImageDescriptor.java:52)
    at org.dcm4che3.img.DicomMetaData.<init>(DicomMetaData.java:34)
    at org.dcm4che3.img.stream.DicomFileInputStream.getMetadata(DicomFileInputStream.java:42)
    at org.dcm4che3.img.DicomImageReader.getStreamMetadata(DicomImageReader.java:192)
    at org.example.Main.main(Main.java:30)

In my case the LutData length is 0 and we try to browse bData in the ByteUtils.bytesToShortsLE method, which causes the error ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 0.

To solve this problem, I opened this PR. Thanks in advance

[nroduit]

Thanks!