Fix[ExpressionValidator]: exclude unusual line terminators

Signed-off-by: Evgeny Malygin <emalygin@bloomberg.net>

Author: 678098

bmq-sdk/src/main/java/com/bloomberg/bmq/impl/infr/util/expressionvalidator/ExpressionScanner.flex

@@ -109,7 +109,7 @@ package com.bloomberg.bmq.impl.infr.util.expressionvalidator;
 [ \t\n] {
 }
 
-. {
+[^] {
 	return new Token(Token.Type.INVALID, yytext(), yychar);
 }