Check fit results instead of excepting KeyError

pyzebra/comm_export.py

@@ -32,7 +32,10 @@ def export_comm(data, path, lorentz=False):
     with open(str(path + extension), "w") as out_file:
         for meas_num, meas in data["Measurements"].items():
             print(meas_num)
-            try:
+            if meas.get("fit") is None:
+                print("Measurement skipped - no fit value for:", meas_num)
+                continue
+
             meas_number_str = f"{meas_num[1:]:{align}{padding[0]}}"
             h_str = f'{int(meas["h_index"]):{padding[1]}}'
             k_str = f'{int(meas["k_index"]):{padding[1]}}'
@@ -55,9 +58,7 @@ def export_comm(data, path, lorentz=False):
                 angle_str3 = f'{meas["nu_angle"]:{padding[3]}}'
                 angle_str4 = f'{meas["unkwn_angle"]:{padding[3]}}'
 
-                sigma_str = (
-                    f'{"{:8.2f}".format(float(meas["fit"]["g_width"][0])):{align}{padding[2]}}'
-                )
+            sigma_str = f'{"{:8.2f}".format(float(meas["fit"]["g_width"][0])):{align}{padding[2]}}'
             line = (
                 meas_number_str
                 + h_str
@@ -72,6 +73,3 @@ def export_comm(data, path, lorentz=False):
                 + "\n"
             )
             out_file.write(line)
-
-            except KeyError:
-                print("Measurement skipped - no fit value for:", meas_num)