histogram limits when query results in only one structure

[eszter137]

When the query finds more than 1 structures, it prints a histogram that I'd expect; however, with only one structure it prints empty bins that are not consistent with the query (e.g. having larger distance than specified in the query below). Maybe the histogram could have the same upper limit as specified by the query or a smaller one.
Query resulting 2 structures:

$ abcd summary -q "dXX_min<1.75" -p dXX_min
dXX_min  count: 3 min:  1.7060e+00 med:  1.7323e+00 max:  1.7468e+00 std:  1.8655e-02 var: 3.4800e-04
▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉                     1 [ 1.7060e+00,      1.7101)
                                         0 [ 1.7101e+00,      1.7141)
                                         0 [ 1.7141e+00,      1.7182)
                                         0 [ 1.7182e+00,      1.7223)
                                         0 [ 1.7223e+00,      1.7264)
                                         0 [ 1.7264e+00,      1.7305)
                                         0 [ 1.7305e+00,      1.7345)
                                         0 [ 1.7345e+00,      1.7386)
                                         0 [ 1.7386e+00,      1.7427)
▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 2 [ 1.7427e+00,      1.7468)

Query resulting 1 structure:

$ abcd summary -q "dXX_min<1.74" -p dXX_min
dXX_min  count: 1 min:  1.7060e+00 med:  1.7060e+00 max:  1.7060e+00 std:  0.0000e+00 var: 0.0000e+00
                                         0 [ 1.2060e+00,      1.3060)
                                         0 [ 1.3060e+00,      1.4060)
                                         0 [ 1.4060e+00,      1.5060)
                                         0 [ 1.5060e+00,      1.6060)
                                         0 [ 1.6060e+00,      1.7060)
▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 1 [ 1.7060e+00,      1.8060)
                                         0 [ 1.8060e+00,      1.9060)
                                         0 [ 1.9060e+00,      2.0060)
                                         0 [ 2.0060e+00,      2.1060)
                                         0 [ 2.1060e+00,      2.2060)

[eszter137]

Similarly with the lower limits:
Query resulting 2 structures:

$ abcd summary -q "E_MP2_3b>0.09" -p E_MP2_3b
E_MP2_3b  count: 2 min:  9.4391e-02 med:  2.5207e-01 max:  4.0975e-01 std:  1.5768e-01 var: 2.4863e-02
▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 1 [ 9.4391e-02,      0.1259)
                                         0 [ 1.2593e-01,      0.1575)
                                         0 [ 1.5746e-01,      0.1890)
                                         0 [ 1.8900e-01,      0.2205)
                                         0 [ 2.2054e-01,      0.2521)
                                         0 [ 2.5207e-01,      0.2836)
                                         0 [ 2.8361e-01,      0.3151)
                                         0 [ 3.1514e-01,      0.3467)
                                         0 [ 3.4668e-01,      0.3782)
▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 1 [ 3.7822e-01,      0.4098)

Query resulting 1 structure:

$ abcd summary -q "E_MP2_3b>0.1" -p E_MP2_3b
E_MP2_3b  count: 1 min:  4.0975e-01 med:  4.0975e-01 max:  4.0975e-01 std:  0.0000e+00 var: 0.0000e+00
                                         0 [-9.0248e-02,      0.0098)
                                         0 [ 9.7515e-03,      0.1098)
                                         0 [ 1.0975e-01,      0.2098)
                                         0 [ 2.0975e-01,      0.3098)
                                         0 [ 3.0975e-01,      0.4098)
▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 1 [ 4.0975e-01,      0.5098)
                                         0 [ 5.0975e-01,      0.6098)
                                         0 [ 6.0975e-01,      0.7098)
                                         0 [ 7.0975e-01,      0.8098)
                                         0 [ 8.0975e-01,      0.9098)

[gabor1]

part of #84