Added error handling for suspend and resume vm

ccnode/libvirtwrapper.py

@@ -173,10 +173,16 @@ class LibvirtVm(VM):
             raise VMError('%s is already running !' % self.get_name())
 
     def suspend(self):
-        self._domain.suspend()
+        try:
+            self._domain.suspend()
+        except libvirt.libvirtError:
+            raise VMError('%s is not running !' % self.get_name())
 
     def resume(self):
-        self._domain.resume()
+        try:
+            self._domain.resume()
+        except libvirt.libvirtError:
+            raise VMError('%s is not running !' % self.get_name())
 
     def get_uuid(self):
         '''