fixed the YAML parsing issue at VersionsParser.kt and develocityUrl

cli/src/main/kotlin/io/github/cdsap/projectgenerator/cli/VersionsParser.kt

@@ -27,6 +27,7 @@ object VersionsParser {
     fun fromFile(file: File): VersionsFile {
         val tree = mapper.readTree(file)
         normalizeGradleVersion(tree)
+        normalizeProjectDefaults(tree)
         return mapper.treeToValue(tree, VersionsFile::class.java)
     }
 
@@ -38,4 +39,14 @@ object VersionsParser {
         val normalized = Gradle.fromValue(gradleNode.asText()).name
         tree.put("gradle", normalized)
     }
+
+    private fun normalizeProjectDefaults(tree: com.fasterxml.jackson.databind.JsonNode) {
+        if (tree !is ObjectNode) return
+        val projectNode = tree.get("project")
+        if (projectNode !is ObjectNode) return
+
+        if (projectNode.get("develocityUrl")?.isNull == true) {
+            projectNode.put("develocityUrl", "")
+        }
+    }
 }

cli/src/test/kotlin/io/github/cdsap/projectgenerator/cli/VersionsParserTest.kt

@@ -124,6 +124,27 @@ class VersionsParserTest {
         assertTrue(versions.additionalBuildGradleRootPlugins.isEmpty())
     }
 
+    @Test
+    fun `parses YAML with empty develocityUrl as blank string`() {
+        val yaml = """
+            project:
+              develocity: "4.1"
+              develocityUrl:
+              jdk: "23"
+            kotlin:
+              kgp: "2.2.10"
+              ksp: "2.2.10-2.0.2"
+              coroutines: "1.10.2"
+        """.trimIndent()
+
+        val file = File(tempDir.toFile(), "versions.yaml").apply { writeText(yaml) }
+        val versions = VersionsParser.fromFile(file).resolve()
+
+        assertEquals("4.1", versions.project.develocity)
+        assertEquals("", versions.project.develocityUrl)
+        assertEquals("23", versions.project.jdk)
+    }
+
     @Test
     fun `parses gradle from YAML case insensitively`() {
         val yaml = """