Fix Issue # 195 : BaseValidationRule.assertValid(String context, String input) causes NPE if input is not valid.

Made changes as required, also getvalid(string,string) should be called instead.
Could not test the changes.
Let me know if the error persists.
Contact : [email protected]

Author: karansanwal

src/main/java/org/owasp/esapi/reference/validation/BaseValidationRule.java

@@ -89,7 +89,7 @@ public final void setEncoder( Encoder encoder ) {
      * {@inheritDoc}
 	 */
 	public void assertValid( String context, String input ) throws ValidationException {
-		getValid( context, input, null );
+		getValid( context, input );
 	}
 
     /**
@@ -100,7 +100,11 @@ public Object getValid( String context, String input, ValidationErrorList errorL
 		try {
 			valid = getValid( context, input );
 		} catch (ValidationException e) {
-			errorList.addError(context, e);
+			if( errorList == null { 
+				throw e;
+			} else {
+				errorList.addError(context, e);
+			}
 		}
 		return valid;
 	}