CSA: Possible to start to analyse too early

Steps to reproduce:

• switch to Debug view and select ClangStaticAnalyzer as the tool in use
• create a widget application project from template or open a project
• hit the run button of the CSA tool while the project parser is still parsing

Current result:

• depending on the build system in use you might get different output (Application Output)
• ClangStaticAnalyzer fails as build does not work (in fact the build cannot even get triggered)

Expected result:

• allow analyze only if project can get build