Don't care about governance cache while the blockchain isn't synced yet (#3089)

`2019-09-14 05:31:13 CGovernanceManager::UpdateCachesAndClean -- Governance Objects: 0 (Proposals: 0, Triggers: 0, Other: 0; Erased: 0), Votes: 0
 59m
 60m
`

Signed-off-by: Pasta <pasta@dashboost.org>

Author: PastaPastaPasta

src/governance/governance.cpp

@@ -339,6 +339,11 @@ void CGovernanceManager::AddGovernanceObject(CGovernanceObject& govobj, CConnman
 
 void CGovernanceManager::UpdateCachesAndClean()
 {
+    // Return on initial sync, spammed the debug.log and provided no use
+    if (!masternodeSync.IsBlockchainSynced()) {
+        return;
+    }
+
     LogPrint(BCLog::GOBJECT, "CGovernanceManager::UpdateCachesAndClean\n");
 
     std::vector<uint256> vecDirtyHashes = mmetaman.GetAndClearDirtyGovernanceObjectHashes();