Removed redundant null checks and fixed a potential file separator issue

worldedit-core/src/main/java/com/boydti/fawe/FaweAPI.java

@@ -188,7 +188,7 @@ public class FaweAPI {
         if (!file.getName().toLowerCase(Locale.ROOT).endsWith(".bd")) {
             throw new IllegalArgumentException("Not a BD file!");
         }
-        String[] path = file.getPath().split(File.separator);
+        String[] path = file.getPath().split(File.separatorChar=='\\' ? "\\\\" : File.separator);
         if (path.length < 3) {
             throw new IllegalArgumentException("Not in history directory!");
         }

worldedit-core/src/main/java/com/boydti/fawe/object/io/FastByteArrayOutputStream.java

@@ -77,11 +77,9 @@ public class FastByteArrayOutputStream extends OutputStream {
         // Check if we have a list of buffers
         int pos = 0;
 
-        if (buffers != null) {
-            for (byte[] bytes : buffers) {
-                System.arraycopy(bytes, 0, data, pos, bytes.length);
-                pos += bytes.length;
-            }
+        for (byte[] bytes : buffers) {
+            System.arraycopy(bytes, 0, data, pos, bytes.length);
+            pos += bytes.length;
         }
 
         // write the internal buffer directly

worldedit-core/src/main/java/com/sk89q/worldedit/extent/inventory/BlockBag.java

@@ -59,12 +59,11 @@ public abstract class BlockBag {
             }
             fetchBlock(blockState);
         } catch (OutOfBlocksException e) {
-            BlockState placed = blockState; // TODO BlockType.getBlockBagItem(id, data);
-            if (placed == null || placed.getBlockType().getMaterial().isAir()) {
+            if (blockState.getBlockType().getMaterial().isAir()) {
                 throw e; // TODO: check
             }
 
-            fetchBlock(placed);
+            fetchBlock(blockState);
         }
     }