GetLLM: Coupling is crashing if input file wasn't cleaned with svd

[elenafol]

Using an ideal tracking file (no noise, but with coupling), coupling computation is crashing and GetLLM produces following error, if cleaning was not used in harmonic analysis:

14:05:11 - GetLlm STDERR: /afs/cern.ch/work/e/efol/public/beta-beat-source/Beta-Beat.src/GetLLM/algorithms/coupling.py:605: RuntimeWarning: divide by zero encountered in divide
14:05:11 - GetLlm STDERR: f_old_out[bn1] = np.average(abs(f1001ij), weights=1/std_f1001ij2)
14:05:11 - GetLlm STDERR: /afs/cern.ch/work/o/omc/anaconda/lib/python2.7/site-packages/numpy/lib/function_base.py:1160: RuntimeWarning: invalid value encountered in double_scalars
14:05:11 - GetLlm STDERR: avg = np.multiply(a, wgt, dtype=result_dtype).sum(axis)/scl
14:05:11 - GetLlm STDERR: /afs/cern.ch/work/e/efol/public/beta-beat-source/Beta-Beat.src/GetLLM/algorithms/coupling.py:610: RuntimeWarning: divide by zero encountered in divide
14:05:11 - GetLlm STDERR: f1001i = np.average(f1001ij, weights=1/std_f1001ij2)
14:05:11 - GetLlm STDERR: /afs/cern.ch/work/e/efol/public/beta-beat-source/Beta-Beat.src/GetLLM/algorithms/coupling.py:611: RuntimeWarning: divide by zero encountered in divide
14:05:11 - GetLlm STDERR: f1010i = np.average(f1010ij, weights=1/std_f1010ij2)
14:05:11 - GetLlm STDERR: /afs/cern.ch/work/e/efol/public/beta-beat-source/Beta-Beat.src/GetLLM/algorithms/coupling.py:613: RuntimeWarning: divide by zero encountered in divide
14:05:11 - GetLlm STDERR: f1001istd = np.sqrt(1/sum(1/std_f1001ij2))
14:05:11 - GetLlm STDERR: /afs/cern.ch/work/e/efol/public/beta-beat-source/Beta-Beat.src/GetLLM/algorithms/coupling.py:614: RuntimeWarning: divide by zero encountered in divide
14:05:11 - GetLlm STDERR: f1010istd = np.sqrt(1/sum(1/std_f1010ij**2))
14:05:11 - GetLlm STDERR: /afs/cern.ch/work/e/efol/public/beta-beat-source/Beta-Beat.src/GetLLM/algorithms/coupling.py:652: RuntimeWarning: divide by zero encountered in double_scalars
14:05:11 - GetLlm STDERR: denom += 1/fwqw[bn2][0][1]**2 # denominator for weighted average