Let a null input to CSVRecord#get(Enum) fail in CSVRecord#get(String).

Author: garydgregory

src/main/java/org/apache/commons/csv/CSVRecord.java

@@ -24,6 +24,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Objects;
 
 /**
  * A CSV record parsed from a CSV file.
@@ -65,7 +66,7 @@ public final class CSVRecord implements Serializable, Iterable<String> {
      * @return the String at the given enum String
      */
     public String get(final Enum<?> e) {
-        return get(e.toString());
+        return get(Objects.toString(e, null));
     }
 
     /**

src/test/java/org/apache/commons/csv/CSVRecordTest.java

@@ -91,6 +91,11 @@ public void testGetUnmappedEnum() {
         assertThrows(IllegalArgumentException.class, () -> recordWithHeader.get(EnumFixture.UNKNOWN_COLUMN));
     }
 
+    @Test
+    public void testGetNullEnum() {
+        assertThrows(IllegalArgumentException.class, () -> recordWithHeader.get((Enum<?>) null));
+    }
+
     @Test
     public void testGetUnmappedName() {
         assertThrows(IllegalArgumentException.class, () -> assertNull(recordWithHeader.get("fourth")));