STA pre-validation issues

STA pre-validation issues

Manage external tools

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source product, source product file and target product file parameters can't be edited or suppressed
Modify to tool: when no tool is selected, to dialog disapear and nothing is launched, this dialog should not disapear until "close" is pressed.

After integration of an "Notepad++" processor, the processor doesn't start, the following traces appear: com.bc.ceres.binding.ValidationException: Value for 'target product directory' must be given   at com.bc.ceres.binding.validators.NotNullValidator.validateValue(NotNullValidator.java:29) ... at org.esa.snap.ui.tooladapter.ToolExecutionForm.<init>(ToolExecutionForm.java:56)