8214971: Replace use of string.equals("") with isEmpty()

Reviewed-by: jlaskey, prappo, lancea, dfuchs, redestad

src/java.base/share/classes/javax/net/ssl/SSLParameters.java

@@ -668,7 +668,7 @@ public class SSLParameters {
         String[] tempProtocols = protocols.clone();
 
         for (String p : tempProtocols) {
-            if (p == null || p.equals("")) {
+            if (p == null || p.isEmpty()) {
                 throw new IllegalArgumentException(
                     "An element of protocols was null/empty");
             }