src/sage/tensor, src/sage/manifolds: Remove parameter 'trivial_symmet…

…ries' again

src/sage/manifolds/differentiable/vectorfield_module.py

@@ -775,8 +775,7 @@ def tensor(self, tensor_type, name=None, latex_name=None, sym=None,
                                                           DegenerateMetric)
         from sage.tensor.modules.comp import CompWithSym
         sym, antisym = CompWithSym._canonicalize_sym_antisym(
-            tensor_type[0] + tensor_type[1], sym, antisym,
-            trivial_symmetries='error')
+            tensor_type[0] + tensor_type[1], sym, antisym)
         if tensor_type == (1,0):
             return self.element_class(self, name=name,
                                       latex_name=latex_name)
@@ -2077,8 +2076,7 @@ def tensor(self, tensor_type, name=None, latex_name=None, sym=None,
                                                           DegenerateMetric)
         from sage.tensor.modules.comp import CompWithSym
         sym, antisym = CompWithSym._canonicalize_sym_antisym(
-            tensor_type[0] + tensor_type[1], sym, antisym,
-            trivial_symmetries='error')
+            tensor_type[0] + tensor_type[1], sym, antisym)
         if tensor_type == (1,0):
             return self.element_class(self, name=name,
                                       latex_name=latex_name)

src/sage/tensor/modules/comp.py

@@ -2982,25 +2982,9 @@ class CompWithSym(Components):
         )
         sage: e + d == d + e
         True
-
-    TESTS:
-
-    Errors are raised if trivial symmetries appear in the list of symmetries or
-    antisymmetries::
-
-        sage: CompWithSym(QQ, V.basis(), 3, sym=[[1]])
-        Traceback (most recent call last):
-        ...
-        IndexError: at least two index positions must be provided to define a symmetry
-        sage: CompWithSym(QQ, V.basis(), 2, antisym=[[]])
-        Traceback (most recent call last):
-        ...
-        IndexError: at least two index positions must be provided to define an antisymmetry
-
     """
     def __init__(self, ring, frame, nb_indices, start_index=0,
-                 output_formatter=None, sym=None, antisym=None,
-                 trivial_symmetries='error'):
+                 output_formatter=None, sym=None, antisym=None):
         r"""
         TESTS::
 
@@ -3012,11 +2996,10 @@ def __init__(self, ring, frame, nb_indices, start_index=0,
         Components.__init__(self, ring, frame, nb_indices, start_index,
                             output_formatter)
         self._sym, self._antisym = self._canonicalize_sym_antisym(
-            nb_indices, sym, antisym, trivial_symmetries=trivial_symmetries)
+            nb_indices, sym, antisym)
 
     @staticmethod
-    def _canonicalize_sym_antisym(nb_indices, sym=None, antisym=None, *,
-                                  trivial_symmetries='drop'):
+    def _canonicalize_sym_antisym(nb_indices, sym=None, antisym=None):
         r"""
         Bring sym and antisym into their canonical form.
 

src/sage/tensor/modules/finite_rank_free_module.py

@@ -1654,18 +1654,14 @@ def tensor(self, tensor_type, name=None, latex_name=None, sym=None,
 
         TESTS:
 
-        Errors are raised if trivial symmetries appear in the list of symmetries or
-        antisymmetries::
+        Trivial symmetries in the list of symmetries or antisymmetries are silently
+        ignored::
 
             sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
             sage: M.tensor((3,0), sym=[[1]])
-            Traceback (most recent call last):
-            ...
-            IndexError: at least two index positions must be provided to define a symmetry
+            Type-(3,0) tensor on the Rank-3 free module M over the Integer Ring
             sage: M.tensor((3,0), antisym=[[]])
-            Traceback (most recent call last):
-            ...
-            IndexError: at least two index positions must be provided to define an antisymmetry
+            Type-(3,0) tensor on the Rank-3 free module M over the Integer Ring
         """
         from .comp import CompWithSym
         sym, antisym = CompWithSym._canonicalize_sym_antisym(