Specify $create_dir=false in calls to wp_upload_dir().

Calls to this function in Anthologize are used to build cache and temp paths.
As such, they never rely on the existence of the year/month directories that
WordPress creates when `wp_upload_dir()` is called with default parameters.

anthologize.php

@@ -88,7 +88,7 @@ public function __construct() {
 		$this->plugin_url   = plugin_dir_url( __FILE__ );
 		$this->includes_dir = trailingslashit( $this->plugin_dir . 'includes' );
 
-		$upload_dir         = wp_upload_dir();
+		$upload_dir         = wp_upload_dir( null, false );
 		$this->cache_dir    = trailingslashit( $upload_dir['basedir'] . '/anthologize-cache' );
 		$this->cache_url    = trailingslashit( $upload_dir['baseurl'] . '/anthologize-cache' );
 

templates/epub/includes/class-epub-builder.php

@@ -114,7 +114,7 @@ public function saveImage($image_url, $image_filename) {
 
     public function createDirs() {
 
-        $upload_dir = wp_upload_dir();
+        $upload_dir = wp_upload_dir( null, false );
         $tempDir = $upload_dir['basedir'] . DIRECTORY_SEPARATOR . 'anthologize-temp';
         if(! is_dir($tempDir)) {
             mkdir($tempDir);

templates/rtf/class-rtf-anthologizer.php

@@ -568,8 +568,8 @@ protected function getImageHexCodeOld($filename) {
   // (this is the only format that seems to work consistently in Word)
 
   protected function getImageHexCode($filename) {
-  
-    $upload_dir_array = wp_upload_dir();
+
+    $upload_dir_array = wp_upload_dir( null, false );
     $tempImageFilename = $upload_dir_array['basedir'] . DIRECTORY_SEPARATOR . 'anthologize-rtf-temp-img.png';
 
     // TODO: get image and save to temp file