Python: Do not break interpreter widget if certain python is broken.

`versionString` might be `null` if python in severe broken.

Such pythons shouldn't be here, and we will fix it as soon as we introduce PythonInterpreterService


(cherry picked from commit d4658e07833d6f886991e794f90e5a16f28e50c3)

IJ-CR-150093

GitOrigin-RevId: e0fe53bdacbd014afa67115c9c9414a0cba9ba59

python/src/com/jetbrains/python/sdk/add/v2/uiUtils.kt

@@ -157,7 +157,9 @@ internal fun SimpleColoredComponent.customizeForPythonInterpreter(interpreter: P
     }
     is ExistingSelectableInterpreter -> {
       icon = PythonPsiApiIcons.Python
-      append(interpreter.sdk.versionString!!)
+      // This is a dirty hack, but version string might be null for invalid pythons
+      // We must fix it after PythonInterpreterService will make sdk needless
+      append(interpreter.sdk.versionString ?: "broken interpreter")
       append(" " + replaceHomePathToTilde(interpreter.homePath), SimpleTextAttributes.GRAYED_SMALL_ATTRIBUTES)
     }
   }