don't set the auth-info and crl points properties if none are found

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/ssl/CertUtils.java

@@ -467,7 +467,11 @@ private static PTuple parseCRLPoints(X509Certificate cert, PythonObjectFactory f
                 }
             }
         }, result);
-        return factory.createTuple(result.toArray(new String[result.size()]));
+        if (result.size() > 0) {
+            return factory.createTuple(result.toArray(new String[result.size()]));
+        } else {
+            return null;
+        }
     }
 
     @TruffleBoundary
@@ -499,7 +503,11 @@ private static PTuple parseCAIssuers(X509Certificate cert, PythonObjectFactory f
                 }
             }
         }, result);
-        return factory.createTuple(result.toArray(new String[result.size()]));
+        if (result.size() > 0) {
+            return factory.createTuple(result.toArray(new String[result.size()]));
+        } else {
+            return null;
+        }
     }
 
     @TruffleBoundary
@@ -531,7 +539,11 @@ private static PTuple parseOCSP(X509Certificate cert, PythonObjectFactory factor
                 }
             }
         }, result);
-        return factory.createTuple(result.toArray(new String[result.size()]));
+        if (result.size() > 0) {
+            return factory.createTuple(result.toArray(new String[result.size()]));
+        } else {
+            return null;
+        }
     }
 
     public enum LoadCertError {