create addon dir if it doesn't exist

common/implementation/bootstrap-addon-loader/src/main/java/com/dfsek/terra/addon/BootstrapAddonLoader.java

@@ -80,7 +80,9 @@ public class BootstrapAddonLoader implements BootstrapBaseAddon<BootstrapBaseAdd
     
     @Override
     public Iterable<BootstrapBaseAddon<?>> loadAddons(Path addonsFolder, BootstrapAddonClassLoader parent) {
+        try {
             Path bootstrapFolder = addonsFolder.resolve("bootstrap");
+            Files.createDirectories(bootstrapFolder);
             logger.debug("Loading bootstrap addons from {}", bootstrapFolder);
     
             try(Stream<Path> bootstrapAddons = Files.walk(bootstrapFolder, 1, FileVisitOption.FOLLOW_LINKS)) {
@@ -89,6 +91,7 @@ public class BootstrapAddonLoader implements BootstrapBaseAddon<BootstrapBaseAdd
                                       .filter(path -> path.toString().endsWith(".jar"))
                                       .map(path -> loadAddon(path, parent))
                                       .collect(Collectors.toList());
+            }
         } catch(IOException e) {
             throw new UncheckedIOException(e);
         }