Revert "Issue CS-5825 Part Resolution"

This reverts commit 9a615ee7b2 which was breaking the build.

engine/storage/volume/src/org/apache/cloudstack/storage/volume/VolumeServiceImpl.java

@@ -1499,7 +1499,6 @@ public class VolumeServiceImpl implements VolumeService {
             snapshot = snapshotMgr.takeSnapshot(volume);
         } catch (Exception e) {
             s_logger.debug("Take snapshot: " + volume.getId() + " failed", e);
-            throw new ResourceAllocationException("Take snapshot for VolumeId: " + volume.getId() + " failed.", ResourceType.snapshot);
         }
 
         return snapshot;