Improve debug logs for failures in rewards calculations

This makes it so when an error occurs from reading from storage it
shows up on the logs rather than just returning None

core/src/ledger/storage/masp_conversions.rs

@@ -53,23 +53,30 @@ where
         .expect("");
 
     //// Values from the last epoch
-    let last_inflation: u64 =
-        wl_storage.read(&token::last_inflation(addr))?.expect("");
+    let last_inflation: u64 = wl_storage
+        .read(&token::last_inflation(addr))
+        .expect("failure to read last inflation")
+        .expect("");
 
-    let last_locked_ratio: Decimal =
-        wl_storage.read(&token::last_locked_ratio(addr))?.expect("");
+    let last_locked_ratio: Decimal = wl_storage
+        .read(&token::last_locked_ratio(addr))
+        .expect("failure to read last inflation")
+        .expect("");
 
     //// Parameters for each token
     let max_reward_rate: Decimal = wl_storage
-        .read(&token::parameters::max_reward_rate(addr))?
+        .read(&token::parameters::max_reward_rate(addr))
+        .expect("max reward should properly decode")
         .expect("");
 
     let kp_gain_nom: Decimal = wl_storage
-        .read(&token::parameters::kp_sp_gain(addr))?
+        .read(&token::parameters::kp_sp_gain(addr))
+        .expect("kp_gain_nom reward should properly decode")
         .expect("");
 
     let kd_gain_nom: Decimal = wl_storage
-        .read(&token::parameters::kd_sp_gain(addr))?
+        .read(&token::parameters::kd_sp_gain(addr))
+        .expect("kd_gain_nom reward should properly decode")
         .expect("");
 
     let locked_target_ratio: Decimal = wl_storage