- Fix error when dragging item with missing child attachment to another library

- Fix another cross-library problem (which may or may not have been exposed) that showed up in testing

chrome/content/zotero/xpcom/attachments.js

@@ -1110,8 +1110,8 @@ Zotero.Attachments = new function(){
 		}
 		newAttachment.save();
 		
-		// Copy over files
-		if (newAttachment.isImportedAttachment()) {
+		// Copy over files if they exist
+		if (newAttachment.isImportedAttachment() && attachment.getFile()) {
 			var dir = Zotero.Attachments.getStorageDirectory(attachment.id);
 			var newDir = Zotero.Attachments.createDirectoryForItem(newAttachment.id);
 			Zotero.File.copyDirectory(dir, newDir);

chrome/content/zotero/xpcom/data/relations.js

@@ -112,15 +112,14 @@ Zotero.Relations = new function () {
 		predicate = _getPrefixAndValue(predicate).join(':');
 		
 		var relation = new Zotero.Relation;
+		if (!libraryID) {
+			libraryID = Zotero.libraryID;
+		}
 		if (libraryID) {
 			relation.libraryID = parseInt(libraryID);
 		}
 		else {
-			libraryID = Zotero.libraryID;
-			if (!libraryID) {
-				libraryID = Zotero.getLocalUserKey(true);
-			}
-			relation.libraryID = parseInt(libraryID);
+			relation.libraryID = "local/" + Zotero.getLocalUserKey(true);
 		}
 		relation.subject = subject;
 		relation.predicate = predicate;

chrome/content/zotero/xpcom/file.js

@@ -184,6 +184,9 @@ Zotero.File = new function(){
 	 * Copies all files from dir into newDir
 	 */
 	this.copyDirectory = function (dir, newDir) {
+		if (!dir.exists()) {
+			throw ("Directory doesn't exist in Zotero.File.copyDirectory()");
+		}
 		var otherFiles = dir.directoryEntries;
 		while (otherFiles.hasMoreElements()) {
 			var file = otherFiles.getNext();