Return all the subtitles even if they are empty. (#2017)

* Return all the subtitles even if they are empty.

* Fixing test

Author: germa89

src/ansys/mapdl/core/misc.py

@@ -929,6 +929,7 @@ def load_step_options(self):
 
     def _get_between(self, init_string, end_string=None, string=None):
         if not string:
+            self._update()
             string = self._stats
 
         st = string.find(init_string) + len(init_string)
@@ -959,8 +960,9 @@ def _get_title(self):
     def _get_stitles(self):
         return [
             re.search(f"SUBTITLE  {i}=(.*)", self._get_titles()).groups(1)[0].strip()
-            for i in range(1, 5)
             if re.search(f"SUBTITLE  {i}=(.*)", self._get_titles())
+            else ""
+            for i in range(1, 5)
         ]
 
     def _get_products(self):

tests/test_misc.py

@@ -150,7 +150,7 @@ def test_info_title(mapdl):
 def test_info_stitle(mapdl):
     info = mapdl.info
 
-    assert not info.stitles
+    assert all([not each for each in info.stitles])
     stitles = ["asfd", "qwer", "zxcv", "jkl"]
     info.stitles = "\n".join(stitles)
 
@@ -162,7 +162,7 @@ def test_info_stitle(mapdl):
     assert stitles == info.stitles
 
     info.stitles = None
-    assert not info.stitles
+    assert all([not each for each in info.stitles])
 
 
 @pytest.mark.parametrize("file_", ["dummy.dumdum", "dumdum.dummy"])