don't complain about directory not being writable if it doesn't exist (IDEA-77763)

java/idea-ui/src/com/intellij/ide/util/newProjectWizard/ProjectNameStep.java

@@ -152,7 +152,7 @@ public class ProjectNameStep extends ModuleWizardStep {
     }
 
     final File file = new File(projectFileDirectory);
-    if (!file.canWrite()) {
+    if (file.exists() && !file.canWrite()) {
       throw new ConfigurationException(String.format("Directory '%s' is not writable!\nPlease choose another project location.", projectFileDirectory));
     }