Wrong "raise" statements in state.py

[gbregman]

We have a few wrong "raise" statement in control/state.py. They have no exception parameter which is only valid when we are in except clause with an active exception:

diff --git a/control/state.py b/control/state.py
index e76fa4d..db93e49 100644
--- a/control/state.py
+++ b/control/state.py
@@ -456,7 +456,7 @@ class OmapGatewayState(GatewayState):
     def _add_key(self, key: str, val: str):
         """Adds key and value to the OMAP."""
         if not self.ioctx:
-            raise
+            raise RuntimeError("Can't add key when Rados is closed")

         try:
             version_update = self.version + 1
@@ -483,7 +483,7 @@ class OmapGatewayState(GatewayState):
     def _remove_key(self, key: str):
         """Removes key from the OMAP."""
         if not self.ioctx:
-            raise
+            raise RuntimeError("Can't remove key when Rados is closed")

         try:
             version_update = self.version + 1
@@ -510,7 +510,7 @@ class OmapGatewayState(GatewayState):
     def delete_state(self):
         """Deletes OMAP object contents."""
         if not self.ioctx:
-            raise
+            raise RuntimeError("Can't delete state when Rados is closed")

         try:
             with rados.WriteOpCtx() as write_op: