Remove extraneous blank lines from error messages.

src/test/regress/expected/alter_table.out

@@ -34,7 +34,6 @@ QUERY: INSERT INTO temp (a, b, c, d, e, f, g, h, i, j, k, l, m, n, p, q, r, s, t
 	'(0,2,4.1,4.1,3.1,3.1)', '(4.1,4.1,3.1,3.1)', '["current" "infinity"]',
 	'1/3', '1,char16', '{1.0,2.0,3.0,4.0}', '{1.0,2.0,3.0,4.0}', '{1,2,3,4}');
 WARN:Relation temp does not have attribute k
-
 QUERY: SELECT * FROM temp;
 initial|a|b|c|d|e|f|g|h|i|j|l|m|n|p|q|r|s|t|u|v|w|x|y|z
 -------+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
@@ -79,7 +78,6 @@ QUERY: INSERT INTO temp (a, b, c, d, e, f, g, h, i, j, k, l, m, n, p, q, r, s, t
 	'(0,2,4.1,4.1,3.1,3.1)', '(4.1,4.1,3.1,3.1)', '["current" "infinity"]',
 	'1/3', '1,char16', '{1.0,2.0,3.0,4.0}', '{1.0,2.0,3.0,4.0}', '{1,2,3,4}');
 WARN:Relation temp does not have attribute k
-
 QUERY: SELECT * FROM temp[,];
 initial|a|b|c|d|e|f|g|h|i|j|l|m|n|p|q|r|s|t|u|v|w|x|y|z
 -------+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-