empty params in /context/iis/conf/*

libs/dnet-exporter-model/src/main/java/eu/dnetlib/openaire/exporter/model/context/IISConfigurationEntry.java

@@ -39,12 +39,14 @@ public class IISConfigurationEntry implements Serializable {
 	}
 
 	public void addParams(final String name, final String... values) {
-		if (StringUtils.isNoneBlank(name) && values != null) {
-			for (final String v : values) {
-				if (StringUtils.isNotBlank(v)) {
-					params.add(new Param().setName(name).setValue(v));
-				}
-			}
+		if (StringUtils.isBlank(name)) { return; }
+
+		if (values == null) {
+			params.add(new Param().setName(name).setValue(""));
+		}
+
+		for (final String v : values) {
+			params.add(new Param().setName(name).setValue(v != null ? v : ""));
 		}
 	}