Add changed skipcond for module tests

test/module/net_sql.mysql.skipcond

@@ -5,7 +5,7 @@ import os
 try:
     (host, port, user, password, db) = os.getenv('MYSQL').split(':')
     for val in (host, port, user, password, db):
-        if val == '':
+        if not val or val == ' ':
             raise ValueError('Empty value')
     if not os.path.exists(os.path.join(self.args.builddir, 'src/module/mysql/mysql.so')):
         raise RuntimeError('No MySQL module found')

test/module/net_sql.pg.skipcond

@@ -5,7 +5,7 @@ import os
 try:
     (host, port, user, password, db) = os.getenv('PG').split(':')
     for val in (host, port, user, password, db):
-        if val == '' :
+        if not val or val == ' ':
             raise ValueError ('Empty value')
     if not os.path.exists(os.path.join(self.args.builddir, 'src/module/pg/pg.so')):
         raise RuntimeError('No PG module found')