fixing bug in Opm::EclIO::ESmry constructor

- changed behaviour when opening summary file from restart run
 - will now work with loadBaseRunData=false and original base run folder
   not found.

python/tests/test_esmry.py

@@ -144,7 +144,6 @@ class TestEclFile(unittest.TestCase):
         self.assertEqual(time0[0], 1.0)
 
         rst_smry1 = ESmry(test_path("data/SPE1CASE1_RST60.SMSPEC"))
-        rst_smry1.make_esmry_file()
 
         rst_ext_smry1 = ESmry(test_path("data/SPE1CASE1_RST60.ESMRY"))