By Stefano Rebaudo (Reuters) – Euro zone government bond yields fell on Tuesday as money markets scaled back their expectations of European Central Bank’s rate hikes amid concerns over potential gas supply cuts. Physical gas flows through the Nord Stream 1 pipeline from Russia to Germany fell to zero on Monday as maintenance of the pipeline began. Governments, markets, and companies are worried the shutdown might be extended due to the war in Ukraine and that reflected in data showing German investor morale nosediving in July, falling below levels at the start of the pandemic. Those concerns h…