Merge branch 'CDOC2-139-empty-label-bugfix' into 'master'

CDOC-139: Fix the empty lowercase label issue

See merge request cdoc2/cdoc2-java-ref-impl!131

Author: Hain Zuppur

cdoc2-lib/src/main/java/ee/cyber/cdoc2/crypto/KeyLabelTools.java

@@ -421,8 +421,10 @@ private static Map<String, String> convertStringToKeyLabelParamsMap(String data)
 
         for (String keyValue : parts) {
             String[] params = keyValue.split(DATA_PARAMETERS_KEY_VALUE_DELIMITER);
-            if (KeyLabelDataFields.LABEL.name().equals(params[0]) && params.length == 1) {
-
+            if (
+                KeyLabelDataFields.LABEL.name().equals(params[0].toUpperCase(Locale.ROOT))
+                    && params.length == 1
+            ) {
                 result.put(params[0], "");
             } else {
                 result.put(params[0], urlDecodeValue(params[1]));