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Don't add arguments templates for parameterless method's completion
When asking for completion on a parameterless method we were trying to install arguments' templates. This operation in not allowed on parameterless methods, and it caused a ``java.lang.IllegalStateException: must specify at least one linked position`` during completion. ``explicitParamNames`` is a ``List[List[String]]`` (because of currying), hence a parameterless method is represented as ``List(List())``. The arguments' templates where added only if ``explicitParamNames`` is not empty, however a ``List(List())`` contains exactly one element (the empty list), hence it's never empty! The fix is really simple, we just need to flatten the ``explicitParamNames`` before checking for emptiness. Fixes #1001591 backport to _release/3.0.x_ review by @dragos
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