Sketchbook fixes

Author: Stefterv

app/src/processing/app/api/Sketch.kt

@@ -25,7 +25,7 @@ class Sketch {
 
         fun getSketches(file: File, filter: (File) -> Boolean = { true }): Folder {
             val name = file.name
-            val (sketchesFolders, childrenFolders) = file.listFiles()?.partition { isSketchFolder(it) } ?: return Folder(
+            val (sketchesFolders, childrenFolders) = file.listFiles()?.filter (File::isDirectory)?.partition { isSketchFolder(it) } ?: return Folder(
                 name = name,
                 path = file.absolutePath,
                 sketches = emptyList(),

app/src/processing/app/api/Sketchbook.kt

@@ -34,7 +34,7 @@ class Sketchbook: SuspendingCliktCommand() {
             // TODO: Currently blocked since `Base.getSketchbookFolder()` is not available in headless mode
             val sketchbookFolder = Platform.getDefaultSketchbookFolder()
 
-            val sketches = getSketches(sketchbookFolder.resolve("sketchbook"))
+            val sketches = getSketches(sketchbookFolder)
             val json = serializer.encodeToString(listOf(sketches))
             println(json)
         }