Remove empty block

Refactor a few classes so that empty blocks are not longer used. For
example, rather than:

	if(x) {
	} else {
		i++;
	}

use:

	if(!x) {
		i++;
	}

Issue gh-8945

web/src/test/java/org/springframework/security/web/authentication/AbstractAuthenticationProcessingFilterTests.java

@@ -533,10 +533,7 @@ public class AbstractAuthenticationProcessingFilterTests {
 		}
 
 		public void doFilter(ServletRequest request, ServletResponse response) {
-			if (expectToProceed) {
-
-			}
-			else {
+			if (!expectToProceed) {
 				fail("Did not expect filter chain to proceed");
 			}
 		}