Pass exception back to user

- check object is not null before closing
 - refs #1160

brut.apktool/apktool-lib/src/main/java/brut/androlib/ApkDecoder.java

@@ -167,6 +167,8 @@ public class ApkDecoder {
             mAndrolib.recordUncompressedFiles(mApkFile, mUncompressedFiles);
             mAndrolib.writeOriginalFiles(mApkFile, outDir);
             writeMetaFile();
+        } catch (Exception ex) {
+            throw ex;
         } finally {
             try {
                 mApkFile.close();

brut.j.dir/src/main/java/brut/directory/ExtFile.java

@@ -56,7 +56,9 @@ public class ExtFile extends File {
     }
 
     public void close() throws IOException {
-        mDirectory.close();
+        if (mDirectory != null) {
+            mDirectory.close();
+        }
     }
 
     private Directory mDirectory;