restore fix for parsing of ZoneId that conflicted with changes for issue 138 (#145)

Author: kupci

datetime/src/main/java/com/fasterxml/jackson/datatype/jsr310/deser/JSR310StringParsableDeserializer.java

@@ -98,7 +98,7 @@ public Object deserialize(JsonParser parser, DeserializationContext context) thr
                 if (!isLenient()) {
                     return _failForNotLenient(parser, context, JsonToken.VALUE_STRING);
                 }
-                return null;
+                return _coerceEmptyString(context, false);
             }
             try {
                 switch (_typeSelector) {

datetime/src/test/java/com/fasterxml/jackson/datatype/jsr310/deser/ZoneIdDeserTest.java

@@ -114,8 +114,7 @@ public void testStrictDeserializeFromEmptyString() throws Exception {
         objectReader.readValue(valueFromEmptyStr);
     }
 
-    // [module-java8#68]: Was to prevent it but... conflicts with [#138]
-    @Ignore
+    // [module-java8#68]
     @Test
     public void testZoneOffsetDeserFromEmpty() throws Exception
     {

datetime/src/test/java/com/fasterxml/jackson/datatype/jsr310/deser/ZoneOffsetDeserTest.java

@@ -182,8 +182,7 @@ public void testStrictDeserializeFromEmptyString() throws Exception {
         objectReader.readValue(valueFromEmptyStr);
     }
 
-    // [module-java8#68]: Was to prevent it but... conflicts with [#138]
-    @Ignore
+    // [module-java8#68]
     @Test
     public void testZoneOffsetDeserFromEmpty() throws Exception
     {

release-notes/VERSION

@@ -15,6 +15,8 @@ due to number of types.
 
 3.0.0 (not yet released)
 
+- #68: Parsing of `ZoneId` should respect `ALLOW_COERCION_OF_SCALARS`
+  wrt empty String
 - Deprecate "paramater names" and "datatypes" modules as functionality
   now included directly in `jackson-databind`
 - Remove legacy `JSR310Module`