__format__ must fall back to __str__ when spec=''

Author: NoureldinYosri

tunits/core/cython/with_unit.pyx

@@ -729,7 +729,7 @@ cdef class WithUnit:
         self.base_units.__setstate__(pickle_info['base_units'])
 
     def __format__(self, spec: str) -> str:
-        if spec == '' and self.value == 1: return str(self)
+        if spec == '': return str(self)
         return self.value.__format__(spec) + ' ' + str(self.unit)
 
 _try_interpret_as_with_unit = None