Stricter and skip the weird statement about fill("", 0)

chapters/annotations.tex

@@ -1747,7 +1747,7 @@ \subsubsection{Conversion Rules}\label{conversion-rules}
 The conversion should generate correct Modelica models using the new version of the library
 corresponding to the old version.
 
-The string arguments for these functions should not be the empty string (except for the string in an empty array of strings).
+The string arguments for these functions shall not be the empty string.
 
 \begin{nonnormative}
 Whenever possible tools should preserve the original style of the model, e.g., use of imports.