fix: return min results (#7098)

Description
---
fixes gprc call network state to always return results even if all the
algos are not enabled


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Bug Fixes**
- Improved error handling when retrieving target difficulty for
proof-of-work algorithms, ensuring the network state is returned even if
some values cannot be determined.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: SWvheerden

applications/minotari_node/src/grpc/base_node_grpc_server.rs

@@ -62,7 +62,7 @@ use tari_core::{
     consensus::{emission::Emission, ConsensusManager, NetworkConsensus},
     iterators::NonOverlappingIntegerPairIter,
     mempool::{service::LocalMempoolService, TxStorageResponse},
-    proof_of_work::PowAlgorithm,
+    proof_of_work::{Difficulty, PowAlgorithm},
     transactions::{
         generate_coinbase_with_wallet_output,
         transaction_components::{
@@ -424,7 +424,8 @@ impl tari_rpc::base_node_server::BaseNode for BaseNodeGrpcServer {
                             e.to_string()
                         );
                         obscure_error_if_true(report_error_flag, Status::internal(e.to_string()))
-                    })?;
+                    })
+                    .unwrap_or(Difficulty::min());
                 let target_time = constants.pow_target_block_interval(PowAlgorithm::Sha3x);
                 let estimated_hash_rate = target_difficulty.as_u64().checked_div(target_time).unwrap_or(0);
                 self.data_cache
@@ -450,7 +451,8 @@ impl tari_rpc::base_node_server::BaseNode for BaseNodeGrpcServer {
                             e.to_string()
                         );
                         obscure_error_if_true(report_error_flag, Status::internal(e.to_string()))
-                    })?;
+                    })
+                    .unwrap_or(Difficulty::min());
                 let target_time = constants.pow_target_block_interval(PowAlgorithm::RandomXM);
                 let estimated_hash_rate = target_difficulty.as_u64().checked_div(target_time).unwrap_or(0);
                 self.data_cache
@@ -477,7 +479,8 @@ impl tari_rpc::base_node_server::BaseNode for BaseNodeGrpcServer {
                             e.to_string()
                         );
                         obscure_error_if_true(report_error_flag, Status::internal(e.to_string()))
-                    })?;
+                    })
+                    .unwrap_or(Difficulty::min());
                 let target_time = constants.pow_target_block_interval(PowAlgorithm::RandomXT);
                 let estimated_hash_rate = target_difficulty.as_u64().checked_div(target_time).unwrap_or(0);
                 self.data_cache