Merge pull request #3487 from HansOlsson/NonEmptyConvertElement

Require that the strings are non-empty.

Author: HansOlsson

chapters/annotations.tex

@@ -1757,8 +1757,8 @@ \subsubsection{Conversion Rules}\label{conversion-rules}
 Conversions should be applied in all places where named element are used in code, including Modelica URIs (for example, in \lstinline!Documentation! annotations).
 \end{nonnormative}
 
-These functions can be called with literal strings or array of strings
-and vectorize according to \cref{scalar-functions-applied-to-array-arguments}.
+These functions can be called with literal strings or arrays of literal strings and vectorize according to \cref{scalar-functions-applied-to-array-arguments}.
+The empty literal string is only allowed when constructing an empty array using \lstinline!fill!.
 
 All of these convert-functions only use inheritance among user models, and not in the library that is used for the conversion -- thus conversions of base classes will require multiple conversion calls; this ensures that the conversion is independent of the new library structure.
 The name of the class used as argument to \lstinline!convertElement! and \lstinline!convertModifiers! is similarly the old name of the class, i.e., the name before it is possibly converted by \lstinline!convertClass!.
@@ -1767,6 +1767,8 @@ \subsubsection{Conversion Rules}\label{conversion-rules}
 Specifying conversions using the old name of a class allows the conversion to be done without access to the old
 version of the library (by suitable modifications of the lookup).  Another alternative is to use the old version
 of the library during the conversion.
+
+The invalid but previously used form \lstinline!convertElement("OldClass", "OldName", "")! should be handled as \lstinline!convertModifiers("OldClass", {"OldName"}, fill("", 0))! without any conversion applied to equations.
 \end{nonnormative}
 
 \paragraph*{convertClass("OldClass", "NewClass")}\label{convertclassoldclassnewclass}\annotationindex{convertClass}