Get rid of checks when creating constructs. Check should handle this.

plainText.go

@@ -1,7 +1,6 @@
 package atom
 
 import (
-	"errors"
 	"fmt"
 )
 
@@ -14,13 +13,9 @@ type PlainText struct {
 // isText checks whether the PlainText is a Text. It returns a bool.
 func (p *PlainText) isText() bool { return true }
 
-// newPlainText creates a new PlainText. It returns a *PlainText and an error.
-func newPlainText(textType, content string) (*PlainText, error) {
-	if content == "" {
-		return nil, errors.New("error creating new plain text: content string empty")
-	}
-
-	return &PlainText{Type: textType, Text: content}, nil
+// newPlainText creates a new PlainText. It returns a *PlainText.
+func newPlainText(textType, content string) *PlainText {
+	return &PlainText{Type: textType, Text: content}
 }
 
 // Check checks the PlainText for incompatibilities with RFC4287. It returns an