Fix for crash on clearing of the parameter name field

diff --git a/src/ParametersPlugin/ParametersPlugin_Validators.cpp b/src/ParametersPlugin/ParametersPlugin_Validators.cpp
index 788e163980f6308e9a1740ee45418c016db22b9c..d15102d64105f8bfdbce812d92a822182e355003 100644 (file)
--- a/src/ParametersPlugin/ParametersPlugin_Validators.cpp
+++ b/src/ParametersPlugin/ParametersPlugin_Validators.cpp
@@ -29,6 +29,8 @@ bool ParametersPlugin_VariableValidator::isValid(const AttributePtr& theAttribut
 
 bool ParametersPlugin_VariableValidator::isVariable(const std::string& theString) const
 {
+  if (theString.empty())
+    return false;
   std::string::const_iterator it = theString.begin();
   if (!(isalpha(*it) || (*it) == '_') || it == theString.end())
     return false;