Resolves problem where duplicate blank barcodes threw errors
form now only checks for duplication when the barcode is non-empty
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@ -40,7 +40,7 @@ function check_additem() {
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var success = true;
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for(i=0;i<barcodes.length;i++){
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for(j=0;j<barcodes.length;j++){
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if( (i > j) && (barcodes[i].value == barcodes[j].value) ) {
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if( (i > j) && (barcodes[i].value == barcodes[j].value) && barcodes[i].value !='') {
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barcodes[i].className='error';
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barcodes[j].className='error';
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success = false;
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