Add try/catch around calls to GetBeaconChainletRoot

The catch for std::runtime_exception will assert, ensuring
Gridcoin stops after resetting the beacon registry.

src/gridcoin/tally.cpp

@@ -1233,7 +1233,11 @@ CAmount Tally::GetNewbieSuperblockAccrualCorrection(const Cpid& cpid, const Supe
     // Walk back the entries in the historical beacon map linked by renewal prev tx hash until the first
     // beacon in the renewal chain is found (the original advertisement). The accrual starts no earlier
     // than here.
-    beacon_ptr = beacons.GetBeaconChainletRoot(beacon);
+    try {
+        beacon_ptr = beacons.GetBeaconChainletRoot(beacon);
+    } catch (std::runtime_error& e) {
+        assert(false);
+    }
 
     const CBlockIndex* pindex_baseline = GRC::Tally::GetBaseline();
 

src/rpc/mining.cpp

@@ -307,7 +307,11 @@ UniValue auditsnapshotaccrual(const UniValue& params, bool fHelp)
 
     UniValue beacon_chain(UniValue::VARR);
 
-    beacon_ptr = beacons.GetBeaconChainletRoot(beacon_ptr, beacon_chain_out_ptr);
+    try {
+        beacon_ptr = beacons.GetBeaconChainletRoot(beacon_ptr, beacon_chain_out_ptr);
+    } catch (std::runtime_error& e) {
+        assert(false);
+    }
 
     for (const auto& iter : *beacon_chain_out_ptr) {
         UniValue beacon_chain_entry(UniValue::VOBJ);