Remove debug statement from test (accidentally left); add a comment

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/databind/deser/std/CollectionDeserializer.java

@@ -312,6 +312,8 @@ protected Collection<Object> _deserializeFromString(JsonParser p, Deserializatio
                 return (Collection<Object>) _deserializeFromEmptyString(
                         p, ctxt, act, rawTargetType, "empty String (\"\")");
             }
+            // note: `CoercionAction.Fail` falls through because we may need to allow
+            // `ACCEPT_SINGLE_VALUE_AS_ARRAY` handling later on
         }
         // 26-Mar-2021, tatu: Some day is today; as per [dataformat-xml#460],
         //    we do need to support blank String too...
@@ -322,6 +324,8 @@ else if (_isBlank(value)) {
                 return (Collection<Object>) _deserializeFromEmptyString(
                         p, ctxt, act, rawTargetType, "blank String (all whitespace)");
             }
+            // note: `CoercionAction.Fail` falls through because we may need to allow
+            // `ACCEPT_SINGLE_VALUE_AS_ARRAY` handling later on
         }
         return handleNonArray(p, ctxt, createDefaultInstance(ctxt));
     }

src/test/java/com/fasterxml/jackson/databind/convert/CoerceContainersTest.java

@@ -41,9 +41,7 @@ public void testScalarCollections() throws Exception
 //            verifyException(e, "Cannot coerce empty String");
             verifyException(e, "Cannot deserialize value of type");
             verifyException(e, "from String value");
-            e.printStackTrace();
         }
-
 
         List<Double> result = _readWithCoercion(listType);
         assertNotNull(result);