fix additional empty line when generating javadoc on a property without description (#415)

Author: hauner

openapi-processor-core/src/main/kotlin/io/openapiprocessor/core/writer/java/DataTypeWriterBase.kt

@@ -95,8 +95,11 @@ abstract class DataTypeWriterBase(
         var result = ""
 
         if (apiOptions.javadoc && !apiOptions.isRecord()) {
-            result += javadocFactory.create(propDataType).indent()
-            result += LF
+            val javadoc = javadocFactory.create(propDataType)
+            if (javadoc.isNotEmpty()) {
+                result += javadoc.indent()
+                result += LF
+            }
         }
 
         result += ifDeprecated(propDataType)

openapi-processor-core/src/testInt/resources/tests/javadoc/inputs/openapi30.yaml

@@ -56,6 +56,8 @@ components:
         this is the *Foo* schema description
       type: object
       properties:
+        no-description:
+          type: string
         foo-bar:
           description: >
             *property* description

openapi-processor-core/src/testInt/resources/tests/javadoc/inputs/openapi31.yaml

@@ -56,6 +56,8 @@ components:
         this is the *Foo* schema description
       type: object
       properties:
+        no-description:
+          type: string
         foo-bar:
           description: >
             *property* description

openapi-processor-core/src/testInt/resources/tests/javadoc/inputs/openapi32.yaml

@@ -52,6 +52,8 @@ components:
         this is the *Foo* schema description
       type: object
       properties:
+        no-description:
+          type: string
         foo-bar:
           description: |
             *property* description

openapi-processor-core/src/testInt/resources/tests/javadoc/outputs/model/_default_/Foo.java

@@ -9,6 +9,9 @@
 @Generated(value = "openapi-processor-core", version = "test")
 public class Foo {
 
+    @JsonProperty("no-description")
+    private String noDescription;
+
     /**
      * <em>property</em> description
      */
@@ -21,6 +24,14 @@ public class Foo {
     @JsonProperty("enum")
     private FooEnum aEnum;
 
+    public String getNoDescription() {
+        return noDescription;
+    }
+
+    public void setNoDescription(String noDescription) {
+        this.noDescription = noDescription;
+    }
+
     public String getFooBar() {
         return fooBar;
     }

openapi-processor-core/src/testInt/resources/tests/javadoc/outputs/model/_record_/Foo.java

@@ -11,6 +11,9 @@
  */
 @Generated(value = "openapi-processor-core", version = "test")
 public record Foo(
+    @JsonProperty("no-description")
+    String noDescription,
+
     @JsonProperty("foo-bar")
     String fooBar,