Handle mining_device open channel error case

.. just return the error to the user to give an indication that an
error occurd.

protocols/v2/roles-logic-sv2/src/errors.rs

@@ -61,6 +61,7 @@ pub enum Error {
     HashrateError(InputError),
     LogicErrorMessage(std::boxed::Box<AllMessages<'static>>),
     JDSMissingTransactions,
+    MiningChannelError(u32),
 }
 
 impl From<BinarySv2Error> for Error {
@@ -153,6 +154,7 @@ impl Display for Error {
             HashrateError(e) => write!(f, "Impossible to get Hashrate: {:?}", e),
             LogicErrorMessage(e) => write!(f, "Message is well formatted but can not be handled: {:?}", e),
             JDSMissingTransactions => write!(f, "JD server cannot propagate the block: missing transactions"),
+            MiningChannelError(e) => write!(f, "Mining channel error: {:?}", e),
         }
     }
 }

roles/test-utils/mining-device/src/lib/mod.rs

@@ -404,9 +404,9 @@ impl ParseUpstreamMiningMessages<(), NullDownstreamMiningSelector, NoRouting> fo
 
     fn handle_open_mining_channel_error(
         &mut self,
-        _: OpenMiningChannelError,
+        e: OpenMiningChannelError,
     ) -> Result<SendTo<()>, Error> {
-        todo!()
+        return Err(Error::MiningChannelError(e.request_id));
     }
 
     fn handle_update_channel_error(&mut self, _: UpdateChannelError) -> Result<SendTo<()>, Error> {