MIDEAST STOCKS-Gulf markets weighed by low oil prices, weak earnings

DUBAI, Oct 26 (Reuters) - Gulf stock markets saw lacklustre trade on Wednesday as low oil prices and weak earnings weighed on investor sentiment. Crude prices declined for a third day, hovering near $50 a barrel for the first time in three weeks, amid doubts that OPEC members will agree to a cut output. "Investor sentiment appears to be weak in general on low earnings visibility," said Vijay Harpalani, fund manager at Dubai-based Al Mal Capital. The potential for an agreement among OPEC producer