refactor!: if clause in Obs.__init__ eliminated, empty observables need

to be initialized with means=[] from now on.

pyerrors/input/json.py

@@ -358,7 +358,7 @@ def _parse_json_dict(json_dict, verbose=True, full_output=False):
             ret = Obs([[ddi[0] + values[0] for ddi in di] for di in od['deltas']], od['names'], idl=od['idl'])
             ret.is_merged = od['is_merged']
         else:
-            ret = Obs([], [])
+            ret = Obs([], [], means=[])
             ret._value = values[0]
         for name in cd:
             co = cd[name][0]
@@ -383,7 +383,7 @@ def _parse_json_dict(json_dict, verbose=True, full_output=False):
                 ret.append(Obs([list(di[:, i] + values[i]) for di in od['deltas']], od['names'], idl=od['idl']))
                 ret[-1].is_merged = od['is_merged']
             else:
-                ret.append(Obs([], []))
+                ret.append(Obs([], [], means=[]))
                 ret[-1]._value = values[i]
                 print('Created Obs with means= ', values[i])
             for name in cd:
@@ -410,7 +410,7 @@ def _parse_json_dict(json_dict, verbose=True, full_output=False):
                 ret.append(Obs([di[:, i] + values[i] for di in od['deltas']], od['names'], idl=od['idl']))
                 ret[-1].is_merged = od['is_merged']
             else:
-                ret.append(Obs([], []))
+                ret.append(Obs([], [], means=[]))
                 ret[-1]._value = values[i]
             for name in cd:
                 co = cd[name][i]

pyerrors/obs.py

@@ -94,7 +94,6 @@ class Obs:
         self.N = 0
         self.is_merged = {}
         self.idl = {}
-        if len(samples):
         if idl is not None:
             for name, idx in sorted(zip(names, idl)):
                 if isinstance(idx, range):
@@ -1522,7 +1521,7 @@ def cov_Obs(means, cov, name, grad=None):
         co : Covobs
             Covobs to be embedded into the Obs
         """
-        o = Obs([], [])
+        o = Obs([], [], means=[])
         o._value = co.value
         o.names.append(co.name)
         o._covobs[co.name] = co

tests/obs_test.py

@@ -653,7 +653,7 @@ def test_covariance_symmetry():
 
 def test_empty_obs():
     o = pe.Obs([np.random.rand(100)], ['test'])
-    q = o + pe.Obs([], [])
+    q = o + pe.Obs([], [], means=[])
     assert q == o