More accurate error message if Java is not installed

SnpEff, Trimmomatic, and FastQC tools require Java to be installed and specified in the UGENE Application Settings.

If a tool is specified in the Application Settings, but Java is not, an error message appears on validation of a workflow with such element. However, the corresponding message needs to be improved.

Scenario:

1. Specify the correct SnpEff executable file in the Application Settings.
2. Make a field for "java" executable empty in the Application Settings.
3. Open the Workflow Designer.
4. Add the "SnpEff Annotation and Filtration" element to the scene.
5. Select the "Genome" parameter.
   Current state: a message box appears with the following error message (see the attached screenshot):

   The list of SnpEff genomes is not available. Path for SnpEff is not selected. Do you you want to select it now?
   

   Expected state: the message should be the following:

   The list of genomes is not available. The SnpEff tool requires java that is not set.
   
   Do you want to select it now?