Missed some cases when no variant folder is used

Author: jan

io.sloeber.core/src/io/sloeber/core/api/BoardDescription.java

@@ -513,7 +513,7 @@ public String getMenuItemIDFromMenuItemName(String menuItemName, String menuID)
     public IPath getActualVariantPath() {
         updateWhenDirty();
         String boardVariant = getBoardVariant();
-        if (boardVariant == null) {
+        if (boardVariant == null || boardVariant.isBlank()) {
             return null;
         }
         if (myReferencedPlatformVariant == null) {

io.sloeber.core/src/io/sloeber/core/internal/SloeberConfiguration.java

@@ -202,6 +202,12 @@ private boolean projectNeedsUpdate() {
 		}
 		IFolder arduinoVariantFolder = getArduinoVariantFolder();
 		IPath variantPath = myBoardDescription.getActualVariantPath();
+		if(variantPath==null && arduinoVariantFolder==null) {
+			return false; 
+		}
+		if(variantPath==null || arduinoVariantFolder==null) {
+			return true;
+		}
 		if ((!variantPath.toFile().exists()) && (arduinoVariantFolder.exists())) {
 //        	System.out.println("projectNeedsUpdate variant Folder exists but sdhould not");
 			return true;