Wrap psd read in try and except

The purpose of this MR is to prevent the last 2 entries from being removed for every psd (when this is only required for buggy LALInference psds). Instead it only removes the last 2 entries if a ValueError is raised.

pesummary/gw/inputs.py

@@ -539,6 +539,9 @@ class _GWInput(_Input):
             "generated and the PSD data will not be added to the metafile."
         )
         try:
+            f = np.genfromtxt(file)
+            return PSD(f)
+        except ValueError:
             f = np.genfromtxt(file, skip_footer=2)
             return PSD(f)
         except FileNotFoundError: