Handle empty translation strings as untranslated as defined in https:…

…//www.gnu.org/software/gettext/manual/html_node/Untranslated-Entries.html. Fixes #9

po.go

@@ -29,7 +29,9 @@ func newTranslation() *translation {
 func (t *translation) get() string {
 	// Look for translation index 0
 	if _, ok := t.trs[0]; ok {
-		return t.trs[0]
+		if t.trs[0] != "" {
+			return t.trs[0]
+		}
 	}
 
 	// Return unstranlated id by default
@@ -39,7 +41,9 @@ func (t *translation) get() string {
 func (t *translation) getN(n int) string {
 	// Look for translation index
 	if _, ok := t.trs[n]; ok {
-		return t.trs[n]
+		if t.trs[n] != "" {
+			return t.trs[n]
+		}
 	}
 
 	// Return unstranlated plural by default

po_test.go

@@ -69,8 +69,17 @@ msgctxt "Ctx"
 msgid "Some random in a context"
 msgstr "Some random translation in a context"
 
+msgid "Empty translation"
+msgstr ""
+
+msgid "Empty plural form singular"
+msgid_plural "Empty plural form"
+msgstr[0] "Singular translated"
+msgstr[1] "
+
 msgid "More"
 msgstr "More translation"
+"
 	`
 
 	// Write PO content to file
@@ -145,8 +154,8 @@ msgstr "More translation"
 
 	// Test syntax error parsed translations
 	tr = po.Get("This one has invalid syntax translations")
-	if tr != "" {
-		t.Errorf("Expected '' but got '%s'", tr)
+	if tr != "This one has invalid syntax translations" {
+		t.Errorf("Expected 'This one has invalid syntax translations' but got '%s'", tr)
 	}
 
 	tr = po.GetN("This one has invalid syntax translations", "This are tests", 4)
@@ -177,6 +186,27 @@ msgstr "More translation"
 		t.Errorf("Expected 'Original' but got '%s'", tr)
 	}
 
+	// Test empty translation strings
+	tr = po.Get("Empty translation")
+	if tr != "Empty translation" {
+		t.Errorf("Expected 'Empty translation' but got '%s'", tr)
+	}
+
+	tr = po.Get("Empty plural form singular")
+	if tr != "Singular translated" {
+		t.Errorf("Expected 'Singular translated' but got '%s'", tr)
+	}
+
+	tr = po.GetN("Empty plural form singular", "Empty plural form", 1)
+	if tr != "Singular translated" {
+		t.Errorf("Expected 'Singular translated' but got '%s'", tr)
+	}
+
+	tr = po.GetN("Empty plural form singular", "Empty plural form", 2)
+	if tr != "Empty plural form" {
+		t.Errorf("Expected 'Empty plural form' but got '%s'", tr)
+	}
+
 	// Test last translation
 	tr = po.Get("More")
 	if tr != "More translation" {