fix object storage nil pointer deref error
diff --git a/rackspace/objectstorage/v1/bulk/requests.go b/rackspace/objectstorage/v1/bulk/requests.go
index 898b73b..0aeec15 100644
--- a/rackspace/objectstorage/v1/bulk/requests.go
+++ b/rackspace/objectstorage/v1/bulk/requests.go
@@ -43,7 +43,9 @@
 		JSONBody:     reqBody,
 		JSONResponse: &res.Body,
 	})
-	res.Header = resp.Header
+	if resp != nil {
+		res.Header = resp.Header
+	}
 	res.Err = err
 	return res
 }
diff --git a/rackspace/objectstorage/v1/cdncontainers/requests.go b/rackspace/objectstorage/v1/cdncontainers/requests.go
index 8e4abbe..6acebb0 100644
--- a/rackspace/objectstorage/v1/cdncontainers/requests.go
+++ b/rackspace/objectstorage/v1/cdncontainers/requests.go
@@ -53,7 +53,9 @@
 		MoreHeaders: h,
 		OkCodes:     []int{201, 202, 204},
 	})
-	res.Header = resp.Header
+	if resp != nil {
+		res.Header = resp.Header
+	}
 	res.Err = err
 	return res
 }
@@ -66,7 +68,9 @@
 	resp, err := c.Request("HEAD", getURL(c, containerName), gophercloud.RequestOpts{
 		OkCodes: []int{200, 204},
 	})
-	res.Header = resp.Header
+	if resp != nil {
+		res.Header = resp.Header
+	}
 	res.Err = err
 	return res
 }
@@ -149,7 +153,9 @@
 		MoreHeaders: h,
 		OkCodes:     []int{202, 204},
 	})
-	res.Header = resp.Header
+	if resp != nil {
+		res.Header = resp.Header
+	}
 	res.Err = err
 	return res
 }