Change plot_biomass and spawning_biomass plots to work through errors

[Schiano-NOAA]

fix(b and sb plots): reformat plots so they still fxn even missing the reference line

[sbreitbart-NOAA]

Both fxns seem really flexible and work well under multiple scenarios. I did notice that the spawning biomass plot creates a ref line with an "SB" label, but the biomass plot doesn't have a "B" label. Was that intentional?

[Schiano-NOAA]

Both fxns seem really flexible and work well under multiple scenarios. I did notice that the spawning biomass plot creates a ref line with an "SB" label, but the biomass plot doesn't have a "B" label. Was that intentional?

@sbreitbart-NOAA they are both supposed to have a label when a line is present, but if the value wasn't found in the data set then no line or label should be present. Are you saying that in the example you tested it didn't put a label or that there is no label in the biomass fxn?

[sbreitbart-NOAA]

Both fxns seem really flexible and work well under multiple scenarios. I did notice that the spawning biomass plot creates a ref line with an "SB" label, but the biomass plot doesn't have a "B" label. Was that intentional?

@sbreitbart-NOAA they are both supposed to have a label when a line is present, but if the value wasn't found in the data set then no line or label should be present. Are you saying that in the example you tested it didn't put a label or that there is no label in the biomass fxn?

In my 2 example datasets, I can get a ref line to show up, but without a label for the biomass plot

[Schiano-NOAA]

Both fxns seem really flexible and work well under multiple scenarios. I did notice that the spawning biomass plot creates a ref line with an "SB" label, but the biomass plot doesn't have a "B" label. Was that intentional?

@sbreitbart-NOAA they are both supposed to have a label when a line is present, but if the value wasn't found in the data set then no line or label should be present. Are you saying that in the example you tested it didn't put a label or that there is no label in the biomass fxn?

In my 2 example datasets, I can get a ref line to show up, but without a label for the biomass plot

@sbreitbart-NOAA Thanks for catching that! Apparently the function never had any notation through this process. I just updated it

[sbreitbart-NOAA]

Two + signs (lines 138, 139) creates an error

[sbreitbart-NOAA]

Besides the extra plus sign, looks good!