Merge branch '406-avoid-NOP-check-for-SAAMG' into 'master'

Resolve "OPAL aborts with "number of particles per cell too low" error when running SAAMG solver"

Closes #406

See merge request !216

src/Track/TrackRun.cpp

@@ -759,6 +759,7 @@ void TrackRun::setupFieldsolver() {
         size_t numParticles = beam->getNumberOfParticles();
 
         if (!opal->inRestartRun() && numParticles < numGridPoints
+            && Util::toUpper(fs->getType()) != std::string("SAAMG") // in SPIRAL/SAAMG we're meshing the whole domain -DW
 #ifdef ENABLE_AMR
             && !Options::amr)
 #else
@@ -878,4 +879,4 @@ double TrackRun::setDistributionParallelT(Beam *beam) {
     // Return charge per macroparticle.
     return beam->getCharge() * beam->getCurrent() / (beam->getFrequency()*1.0e6) / numberOfParticles;
 
-}
\ No newline at end of file
+}