Remove check on Streams User deserialization that requires a topics.r…

src/main/java/com/purbon/kafka/topology/serdes/TopologyCustomDeserializer.java

@@ -427,17 +427,6 @@ private Optional<PlatformSystem> doStreamsElements(JsonParser parser, JsonNode n
                 + " might require both read and write topics as per its "
                 + "nature it is always reading and writing into Apache Kafka, be aware if you notice problems.");
       }
-      if (topics.get(KStream.READ_TOPICS).isEmpty()) {
-        // should have at minimum read topics defined as we could think of write topics as internal
-        // topics being
-        // auto created.
-        throw new IOException(
-            "Kafka Streams application with Id "
-                + ks.getApplicationId()
-                + " and principal "
-                + ks.getPrincipal()
-                + " have missing read topics. This field is required.");
-      }
     }
     return Optional.of(new PlatformSystem(streams));
   }

src/test/java/com/purbon/kafka/topology/TopologySerdesTest.java

@@ -86,11 +86,6 @@ public void testStreamsParsingOnlyReadTopicsShouldNotParseAsNull() {
     }
   }
 
-  @Test(expected = TopologyParsingException.class)
-  public void testStreamsParsingOnlyWriteTopicsShoulRaiseAnException() {
-    parser.deserialise(TestUtils.getResourceFile("/descriptor-streams-only-write.yaml"));
-  }
-
   @Test
   public void testDynamicFirstLevelAttributes() {
     Topology topology =