Removing the empty strings columns

src/Class_Mod/DxReader.py

@@ -88,7 +88,9 @@ class DxRead:
         return self.spectra
     @property
     def md_df_(self):
-        return self.metadata_.drop("concentrations", axis = 1)
+        me = self.metadata_.drop("concentrations", axis = 1)
+        me = me.drop(me.columns[(me == '').all()], axis = 1)
+        return me
     
     @property
     def chem_data_(self):