message: Fix typo in error messages.
diff: @@ -44,7 +44,7 @@ bool AttrValues::hasValue( const Attribute * attr ) const
  if (attr == AXOM_NULLPTR)
  {
  SLIC_CHECK_MSG(attr != AXOM_NULLPTR,
  - "hasValue: called willout an Attribute");
  + "hasValue: called without an Attribute");
  return false;
  }
  @@ -86,7 +86,7 @@ bool AttrValues::createNode(const Attribute * attr)
  if (attr == AXOM_NULLPTR)
  {
  SLIC_CHECK_MSG(attr != AXOM_NULLPTR,
  - "createNode: called willout an Attribute");
  + "createNode: called without an Attribute");
  return false;
  }
  @@ -122,7 +122,7 @@ Node::ConstValue AttrValues::getScalar( const Attribute * attr ) const
  if (attr == AXOM_NULLPTR)
  {
  SLIC_CHECK_MSG(attr != AXOM_NULLPTR,
  - "getScalar: called willout an Attribute");
  + "getScalar: called without an Attribute");
  return getEmptyNodeRef().value();
  }
  @@ -142,14 +142,18 @@ const char * AttrValues::getString( const Attribute * attr ) const
  if (attr == AXOM_NULLPTR)
  {
  SLIC_CHECK_MSG(attr != AXOM_NULLPTR,
  - "getString: called willout an Attribute");
  + "getString: called without an Attribute");
  return AXOM_NULLPTR;
  }
  if (attr->getTypeID() != CHAR8_STR_ID)
  {
  SLIC_CHECK_MSG(attr->getTypeID() == CHAR8_STR_ID,
  - "getString: Called on an attribute that was not a string");
  + "getString: Called on attribute '"
  + << attr->getName()
  + << "' which is type "
  + << DataType::id_to_name(attr->getTypeID())
  + << ".");
  return AXOM_NULLPTR;
  }
  @@ -169,7 +173,7 @@ const Node & AttrValues::getValueNodeRef( const Attribute * attr ) const
  if (attr == AXOM_NULLPTR)
  {
  SLIC_CHECK_MSG(attr != AXOM_NULLPTR,
  - "getValueNodeRef: called willout an Attribute");
  + "getValueNodeRef: called without an Attribute");
  return getEmptyNodeRef();
  }
  