Fix implementation of GetBlockHash in CBlockIndex and CDiskBlockIndex

src/chain.h

@@ -512,13 +512,7 @@ public:
 
     uint256 GetBlockHash() const
     {
-        if(phashBlock == NULL) {
-            auto header = this->GetBlockHeader();
-            auto blockhash = header.GetHash();
-            fprintf(stderr, "GetBlockHash: phashBlock NULL at height %d, returning blockhash=%s instead\n", this->GetHeight(), blockhash.ToString().c_str() );
-            // assert(phashBlock);
-            return blockhash;
-        }
+        assert(phashBlock);
         return *phashBlock;
     }
 
@@ -683,6 +677,11 @@ public:
         }
     }
 
+    uint256 GetBlockHash() const
+    {
+        return GetBlockHeader().GetHash();
+    }
+
     //! Get the block header for this block index.
     CBlockHeader GetBlockHeader() const
     {