Make value in AZ transact default to something sensible.

alethzero/Transact.cpp

@@ -237,6 +237,8 @@ void Transact::rejigData()
 		if (!ui->gas->isEnabled())
 			ui->gas->setValue(m_backupGas);
 		ui->gas->setEnabled(true);
+		if (ui->gas->value() == ui->gas->minimum())
+			ui->gas->setValue((int)(m_ethereum->postState().gasLimitRemaining() / 10));
 	}
 	else
 	{

libethereum/BlockChain.cpp

@@ -431,9 +431,7 @@ h256s BlockChain::treeRoute(h256 _from, h256 _to, h256* o_common, bool _pre, boo
 {
 	//	cdebug << "treeRoute" << _from.abridged() << "..." << _to.abridged();
 	if (!_from || !_to)
-	{
 		return h256s();
-	}
 	h256s ret;
 	h256s back;
 	unsigned fn = details(_from).number;

libethereum/EthereumPeer.cpp

@@ -505,6 +505,10 @@ bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
 		return false;
 	}
 	}
+	catch (Exception const& _e)
+	{
+		clogS(NetWarn) << "Peer causing an Exception:" << _e.what() << _r;
+	}
 	catch (std::exception const& _e)
 	{
 		clogS(NetWarn) << "Peer causing an exception:" << _e.what() << _r;