madrid catalan pro-independence party pdecat catalan democratic party say monday take part snap regional elections dec.21 tacit admission catalonia previous rule party fire parliament dissolve early another catalan pro-independence party esquerra republicana de catalunya erc also say would participate elections spain prime minister mariano rajoy sack regional government dissolve parliament call snap election friday catalonia leaders make unilateral declaration independence catalan pro-independence party pdecat say take part december 21 election