Print the reason why a notification spec failed to parse

src/cryptonote_core/cryptonote_core.cpp

@@ -601,7 +601,7 @@ namespace cryptonote
     }
     catch (const std::exception &e)
     {
-      MERROR("Failed to parse block notify spec");
+      MERROR("Failed to parse block notify spec: " << e.what());
     }
 
     try
@@ -611,7 +611,7 @@ namespace cryptonote
     }
     catch (const std::exception &e)
     {
-      MERROR("Failed to parse reorg notify spec");
+      MERROR("Failed to parse reorg notify spec: " << e.what());
     }
 
     try

src/wallet/wallet2.cpp

@@ -373,7 +373,7 @@ std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variabl
   }
   catch (const std::exception &e)
   {
-    MERROR("Failed to parse tx notify spec");
+    MERROR("Failed to parse tx notify spec: " << e.what());
   }
 
   return wallet;